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. You can also check your iOS Settings under Subscriptions to manage or cancel it, but remember canceling won’t automatically refund any charges