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

https://blogfreely.net/samuel-wang09/i-cant-find-the-supergrok-invoice-number-where-is-it

If Apple billed your SuperGrok subscription, you can request a refund at reportaproblem.apple.com. Go to your iOS Settings, tap your Apple ID, then Subscriptions to find SuperGrok