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

https://blast-wiki.win/index.php/I_Can%E2%80%99t_See_the_Cancel_Button_for_SuperGrok_in_Subscriptions:_What_to_Do

If Apple billed your SuperGrok subscription, visit reportaproblem.apple.com to request a refund. You can also check your iOS Subscriptions settings to manage or cancel the subscription