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

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 so through the same billing channel you used to buy it—whether that’s web/Stripe, Apple, Google Play, Business, or API