I actually cancelled my ChatGPT subscription in late 2024 and documented the process, kind of as a social media thing because it had gotten so bad and I realized nobody in my family was using it anymore. I asked my wife if she was getting any use out of it and she told me she had been using Gemini and Grok for months because "GPT is very lazy now".
After a while another charge came in for the subscription, but I had the receipts: we had cancelled before the next billing cycle. I decided to try and reach out to OpenAI to resolve this, but they only let you chat with GPT itself for this, which it failed at and told me they weren't in the wrong and none of the information matched what actually happened.
I took this and used it to submit a chargeback request with Privacy.com, which I use for all of my online purchases. Normally I don't have to worry about this because I set a limit or cancel the cards I issue manually, but I had an OpenAI API account using the same card and I had been a bit lazy in using the same card for technically two different services.
Well, Privacy.com won that dispute and I got that money back. It's worth mentioning this is actually different than most banks will do now days. For the most part when you try to get a bank to do a chargeback they just roll it into their insurance and refund you the customer as a cost of doing business, but the actual scammer or shady merchant got to keep their stolen money, whereas I can be certain OpenAI didn't keep my money.