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

https://direct-wiki.win/index.php/How_Do_I_Avoid_Getting_Charged_Again_While_Waiting_for_an_Apple_Refund_Decision%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