To cancel Grok, make sure you do it through the same place where you signed...

https://wiki-byte.win/index.php/Google_Play_Cancel_Button_Missing_for_SuperGrok_%E2%80%93_Why%3F

To cancel Grok, make sure you do it through the same place where you signed up—whether that’s grok.com (Stripe), Apple Subscriptions, Google Play, X Premium on x.com, console.x.ai for Business, or console.x.ai Billing for API auto-recharge