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

https://garrettsbestblogs.theglensecret.com/how-do-i-cancel-and-refund-supergrok-if-i-have-both-iphone-and-ipad

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