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

https://astro-wiki.win/index.php/How_Do_I_Avoid_Accidentally_Paying_for_ChatGPT_Twice%3F

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