We are sorry you feel this way.
To provide context to other readers, we started providing parts to this customer during COVID. As the relationship progressed, the customer stopped paying their bills in a timely manner - if at all. Eventually, when we got the account up to date, we informed them that all future orders were going to be cash in advance. They felt this was unfair and "rude" so they moved the business elsewhere. Fast forward another year and they reached back out via our website contact section, asking to make them parts. We said we would, but they would need to be CIA for slow/non-paying customers. Again, our sales person was told they were "RUDE" to which the customer was told, "thanks, but no thanks" for your business. You can take it elsewhere.
Two sides to every story.