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

https://victor-wiki.win/index.php/EU_14-Day_Right_for_ChatGPT_Refunds_%E2%80%93_How_Do_I_Ask_For_It%3F

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