If a website won't let you cancel, call your bank to force them to block the payment. This will cost the website $20 and a ding on their credit report. Be aware the website will ban you, so you'll need to make a new account.

Which is exactly why Amazon can get away with it. I’m not going to get permabanned from what is essentially a utility in the western world in 2026 by going nuclear with a credit card chargeback.