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

https://smoothdecorator.com/how-do-i-cancel-supergrok-if-settings-subscriptions-is-blank/

If Apple billed your SuperGrok subscription, go to reportaproblem.apple.com and sign in with your Apple ID. Select iOS Subscriptions, find SuperGrok, and request a refund