To cancel Grok, make sure you use the exact billing channel you originally...

https://extra-wiki.win/index.php/How_Do_I_Get_a_Google_Play_Refund_for_SuperGrok_Within_48_Hours%3F

To cancel Grok, make sure you use the exact billing channel you originally signed up with—whether that’s grok.com/Stripe, Apple Subscriptions, Google Play, X Premium on x.com, or console.x.ai for Business or API billing