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

https://smart-wiki.win/index.php/Can_I_Resubscribe_to_ChatGPT_After_Canceling_with_No_Penalty%3F

To cancel your ChatGPT subscription, be sure to do it through the same billing channel you used to sign up—web/Stripe, Apple, Google Play, Business, or API