If Apple billed your SuperGrok subscription, go to reportaproblem.apple.com to...

https://wiki-global.win/index.php/How_Do_I_Confirm_My_SuperGrok_Cancellation_Actually_Went_Through%3F

If Apple billed your SuperGrok subscription, go to reportaproblem.apple.com to request a refund. You can also check your iOS Settings under Subscriptions to manage or cancel it