To cancel Grok correctly, use the same billing channel you signed up...

https://wiki-coast.win/index.php/How_Do_I_Cancel_X_Premium_So_Grok_Access_Ends%3F

To cancel Grok correctly, use the same billing channel you signed up with—whether that’s grok.com/Stripe, Apple Subscriptions, Google Play, X Premium on x.com, or your Business/API billing portal at console.x.ai