Sumo Arvostelua 

I received a massive bill (>$4500) after no meter reads has been done for 18 months. This was not identified by Sumo. Their bills also say “meter read date” as their estimated date which feels deliberately misleading. Furthermore, the bill applied all the energy usage at the highest rate (50% higher) than the vast majority of the energy use period. It took a very long time for them to understand this issue and ultimately issue a reduced bill (although still approx $4000). I arranged lower rates, which were subsequently increased again 4 weeks later by 35%. They refused to alter the bill to the previously arranged rates.

My tarrifs went up by 105% from August to September, resulting in a $400 bill shock. They claim to have sent me an email on 15 July which they say I opened at 5:15am. I have no record of such an email. This story seems common with users hence I'm posting to warn - don't get sucked in by teaser offers (my first 3 bills were fine, the 4th was the jump). The only saving grace (hence the second star) was the guy on the phone was sympathetic enough and moved me back to a cheaper plan even knowing I would be leaving, to save me the sting in the changeover period. It's a low ethics but maybe still credible company.

Like many other people have also experienced recently.

I signed up a year ago and the last two months they more than doubled our energy rates with comparable providers charting 30-40% less (even with the VIC energy price hikes).

We will be re-reporting this company to the energy regulator and ombudsman.

Transferred at the beginning of July because of cheaper advertised rates. Got an increase letter in mid july, and another at end of july, now the rates are nearly double my last provider. Wasted my time, wasted my money. Today on searching reviews saw they were fined by ACCC in 2021 for the same thing. I tried emailing them... no email address on their website (red flag there!) and they have no google business listing (red flag!) Not on facebook messenger (red flag!) and they ban you if you leave a negative comment on their posts because they won't get back to you (huge red flag). I'll be making a complaint to ACCC and Ombudsman today.

There are TWO lies in that reply. I have all correspondence from Sumo during my sign up, and none of it advise of a July increase. Second, the DID ban my profile from their Facebook page because I can no longer see their page. Oh and I have double checked the increase letters, and wonder if they would like to double down on their “we sent a correction” assertion? Because I doubt the ACCC is going to see it that way - I don’t.

Poor, unhappy , have exit fee $160+ more

In July 2025, Red Energy Gas informed me they were raising their charges per MJ. Sumo Gas' website states their charges per MJ is around $0.29/MJ which is way lower than Red's new charges. So I joined Sumo Gas. Soon as they've processed my transfer, I received an email from Sumo stating their charges increased to $0.39/MJ plus daily charge has also increased by around 30% which is much higher than Red's. So quickly tried to switch provider again but it took more than a month to switch. In short, I have to pay Sumo their inflated charges for the time they conned me into joining them. I'll never even peek at Sumo website again when comparing energy prices. BE WARNED!!!

very stupid options with sumo, the customer service was unprofessional, lack of knowledge, the feed in tariff solar price is $0!!! when you ask why the need the solar panels, they have no idea !!! what kind of company on the planet?

I moved to Sumo due to their competitive pricing, only to have prices ramped by 30% (both daily connection fee and usage fee) within the first nine months. Yes, 30%!! I almost fell off my chair. Of course I left them within days, but there are cohorts of people out there that are not tech savvy to go onto comparison sites, or those too busy for life admin or others that simply don't understand the pricing / charges - these people are getting ripped off by these corporate fraudsters, and hence that's Sumo's business model. The ACCC need to either shut down these "pump & dump" practices or close this business down entirely. Ideally the later given the blatancy of their business practices. Conclusion: I recommend take them up on their cheap, hopefully likely loss-making customer-acquisition deal, but be ready to jump when they go to shaft you.

they raised the rates one week after i signed up even though bills were supposed to be issued quarterly, and was charged only peak rates. Impossible to contact, they changed their number that was on the bill. Stay away.

They changed my rates 3 weeks after I signed up. What a scam. I will now change providers. I am not putting up with this type of behaviour. Many other customers are reporting the same thing.

DON'T SIGN UP TO SUMO
They offer a good introductory rate/price, then increase it after 2 weeks of joining in my case.
Even now if I am within my SUMO APP, and apply to sign up as a new customer I get shown their CHEAP RATE. It's almost impossible to contact them, you can’t email or message them, you HAVE TO WAIT ON THE PHONE

if i could i would give 0 star!!!! offer you a great rate, nothing told when signing up saying the prices will rise, then you get a email saying the rates are going up 5 days after signing up, they have already been fined by the ACCC for what they are doing. dodgy company!

Gets you in at a cheap price less than 2 weeks later an email saying the prices are going up more than I was paying before the switch

What incompetence! Joined with the assurance that rates have already gone up. Within three weeks received an email stating new rate hike above every competitor. Then sent a "no reply" email stating it was wrong. Who is managing this company because they should be gone! Customers leaving in droves. Don't go near this mob because they don't know what customer relations mean!

Less than 2 weeks after signing up with Sumo they increased their rates 22c per day supply charge and 9c/kWh, a 30% increase. Absolutely pathetic. I will be moving on after this dreadful brief stint.

From 1 August 2025, your electricity rates are increasing. It doubled my rate, trash.

Witin 2 weeks received notice that I was being moved to another plan and my delivery charges were doubling, usage charges up by 20%. Yeah right, how dumb do they think we are, I had a thought when I moved that this would happen and here we go. Online portal sucks, can't track usage and you cannot even see what plan you're on and what the rates are. This must be on purpose so you can get overcharged sneakily by this scummy retailer. Edit, was NEVER INFORMED as who would go through the effort of changing and then changing back. Silly obvious deflection from pathetic company

Terrible customer service!!
I called the hotline as I’m interested in joining the energy plan, but I have questions about my meter tariff. The staff is not helpful and rude, as the guy just hung up suddenly without saying anything or a polite ending that a customer service reps would usually do. Perhaps I couldn’t continue to sign up, so he just doesn’t bother to say anything.