To get a refund for SuperGrok billed by Apple, visit reportaproblem.apple.com...

https://www.bookmark-xray.win/if-you-want-a-refund-for-supergrok-first-double-check-who-actually-billed

To get a refund for SuperGrok billed by Apple, visit reportaproblem.apple.com and sign in with your Apple ID. Navigate to iOS Subscriptions, find SuperGrok, and request a refund