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

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

If Apple billed your SuperGrok subscription, go to reportaproblem.apple.com to request a refund. Cancelling the subscription in your iOS Settings under Subscriptions stops future charges but does not refund past payments