If Apple billed you for your SuperGrok subscription and you need a refund,...

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

If Apple billed you for your SuperGrok subscription and you need a refund, visit reportaproblem.apple.com and sign in. Go to the iOS Subscriptions section, find SuperGrok, and request a refund there