To cancel Grok, make sure you do it through the same billing channel you used...

https://sticky-wiki.win/index.php/What_Email_Addresses_Should_I_Search_to_Find_My_Grok_Billing_Receipt_Fast%3F

To cancel Grok, make sure you do it through the same billing channel you used to subscribe—whether that’s grok.com/Stripe, Apple Subscriptions, Google Play, X Premium on x.com, or console.x.ai for Business or API billing