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

https://romeo-wiki.win/index.php/Why_Does_ChatGPT_Still_Show_Renewing_After_I_Canceled%3F

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