Steam’s been let off. Good. But was it really Steinberg’s fault that YOU missed the deadline? Mitten saw something funny about that so I’m not surprised that the support team did too whatever the truth of the matter is. They just didn’t take your word for it. My local council’s the same with explanations about parking tickets.
If you’re not happy then move, don’t look back. To a company that you don’t like YOUR words are cheap. Don’t follow the words with more money. Money is what motivates a company response whatever the company. You can’t take good will (or bad) to the bank. Fact of life. Good luck.
My bet is you’ll still be here in 6 months when C7 is out. 