If Apple billed your SuperGrok subscription and you want a refund, visit...

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

If Apple billed your SuperGrok subscription and you want a refund, visit reportaproblem.apple.com. Sign in and choose your purchase under iOS Subscriptions. Keep in mind, canceling the subscription stops future charges but doesn’t refund past payments