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

https://zaneznae304.lucialpiazzale.com/i-requested-a-refund-will-i-lose-access-to-supergrok-immediately

If Apple billed your SuperGrok subscription, you can request a refund at reportaproblem.apple.com. Navigate to iOS Subscriptions, find SuperGrok, and select "Report a Problem