If Apple billed your SuperGrok subscription, you’ll need to request a refund...

https://holdenlvxt779.theburnward.com/what-refund-reason-should-i-pick-for-supergrok-on-apple

If Apple billed your SuperGrok subscription, you’ll need to request a refund through reportaproblem.apple.com. Just sign in, go to the iOS Subscriptions section, find SuperGrok, and follow the steps to report the issue