If Apple billed your SuperGrok subscription, you can request a refund at...

https://magic-wiki.win/index.php/SuperGrok_Not_Showing_in_My_Apple_Subscriptions_List%3F_Here%E2%80%99s_Why_%26_How_to_Fix_It

If Apple billed your SuperGrok subscription, you can request a refund at reportaproblem.apple.com. Go to your iOS device’s Settings, tap your Apple ID, then Subscriptions to find SuperGrok