If Apple billed your SuperGrok subscription, go to reportaproblem.apple.com and...

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

If Apple billed your SuperGrok subscription, go to reportaproblem.apple.com and sign in with your Apple ID. Select iOS Subscriptions, find SuperGrok, and request a refund