To cancel your ChatGPT subscription, be sure to do it through the same billing...

https://mike-wiki.win/index.php/Uninstalling_ChatGPT_Did_Not_Stop_Billing_%E2%80%93_Why%3F

To cancel your ChatGPT subscription, be sure to do it through the same billing channel you used—whether that’s the web, Stripe, Apple, Google Play, Business, or API