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

https://milosinterestingcolumns.huicopper.com/i-can-t-find-the-supergrok-invoice-number-where-is-it

If Apple billed your SuperGrok subscription, you can request a refund at reportaproblem.apple.com. Just log in, go to your iOS Subscriptions, select SuperGrok, and follow the steps to report a problem