To cancel Grok, be sure to stop your subscription through the same billing...

https://bizzmarkblog.com/how-do-i-request-an-apple-refund-for-supergrok/

To cancel Grok, be sure to stop your subscription through the same billing channel you originally used—whether that’s grok.com via Stripe, Apple Subscriptions, Google Play, X Premium on x.com, or console.x.ai for Business/API