To cancel Grok properly, make sure you cancel through the same billing channel...

https://mighty-wiki.win/index.php/If_My_X_Premium_Was_Bought_in_the_iPhone_App,_Where_Do_I_Cancel_It%3F

To cancel Grok properly, make sure you cancel through the same billing channel you signed up with—whether that’s grok.com (Stripe), Apple Subscriptions, Google Play, X Premium on x.com, console.x.ai for Business, or console.x