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

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

If Apple billed your SuperGrok subscription, head to reportaproblem.apple.com to request a refund. Navigate to iOS Subscriptions, find SuperGrok, and choose the issue