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

https://fun-wiki.win/index.php/How_Do_I_Handle_SuperGrok_Refunds_if_I_Paid_Directly_and_Not_Through_Apple%3F

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