To cancel your ChatGPT subscription, use the same platform where you signed...

https://wiki-aero.win/index.php/Why_Is_the_Cancel_Link_So_Hard_to_Find_in_ChatGPT_Billing%3F

To cancel your ChatGPT subscription, use the same platform where you signed up—whether that’s the web (Stripe), Apple App Store, Google Play, Business portal, or API dashboard