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

https://fun-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 directly from Apple. Remember, canceling your subscription in iOS Settings under Subscriptions stops future payments but doesn’t refund past charges