If Apple billed you for SuperGrok and you want a refund, visit...

https://atomic-wiki.win/index.php/How_Do_I_Find_My_SuperGrok_Purchase_in_Apple_Purchase_History%3F

If Apple billed you for SuperGrok and you want a refund, visit reportaproblem.apple.com to request it directly. Remember, just canceling your subscription in iOS Settings > Subscriptions won't issue a refund automatically