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

https://star-wiki.win/index.php/I_Unassigned_a_Grok_License_Seat_But_Billing_Didn%E2%80%99t_Stop_%E2%80%93_Why%3F

To cancel Grok properly, make sure you use 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.ai Billing for API auto-recharge