If Apple billed your SuperGrok subscription, you can request a refund at...

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

If Apple billed your SuperGrok subscription, you can request a refund at reportaproblem.apple.com. Just log in, go to your iOS Subscriptions, select SuperGrok, and follow the steps to report a problem