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

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

If Apple billed your SuperGrok subscription, go to reportaproblem.apple.com to request a refund. Navigate to iOS Subscriptions to find SuperGrok and submit your refund request there