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

https://oscar-wiki.win/index.php/Do_I_Need_to_Cancel_SuperGrok_Before_Requesting_an_Apple_Refund%3F

If Apple billed your SuperGrok subscription by mistake, visit reportaproblem.apple.com to request a refund. Go to Settings > your Apple ID > Subscriptions to check your subscription status