If you want a refund for SuperGrok, first make sure Apple actually billed you....

https://sierra-wiki.win/index.php/How_Do_I_Request_an_Apple_Refund_for_SuperGrok%3F

If you want a refund for SuperGrok, first make sure Apple actually billed you. Check your iOS Subscriptions to confirm it’s on there. Simply canceling the subscription won’t give you a refund. To request one, go to reportaproblem.apple