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

https://charlie-wiki.win/index.php/What_if_SuperGrok_Isn%27t_Listed_Under_Subscriptions_But_I_Was_Charged%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