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

https://oscar-wiki.win/index.php/I_Subscribed_on_Grok.com_-_Can_Apple_Refund_Me%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