To cancel your ChatGPT subscription, you must do so through the same channel...

https://wiki-saloon.win/index.php/Can_OpenAI_Cancel_My_ChatGPT_Subscription_If_I_Am_Locked_Out%3F

To cancel your ChatGPT subscription, you must do so through the same channel you signed up with, like the web (Stripe), Apple, Google Play, Business, or API