If Apple billed your SuperGrok subscription by mistake, visit...

https://touch-wiki.win/index.php/Can_Apple_Support_Help_If_I_Have_the_Receipt_Date_but_No_Invoice_Number%3F

If Apple billed your SuperGrok subscription by mistake, visit reportaproblem.apple.com to request a refund. Navigate to your iOS Subscriptions in Settings to find SuperGrok, but note that canceling the subscription does not automatically issue a refund