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

https://wiki-book.win/index.php/Why_Does_the_ChatGPT_App_Still_Say_Auto-Renews_After_I_Canceled_on_iPhone%3F

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