If Apple billed your SuperGrok subscription, go to reportaproblem.apple.com to...

https://foxtrot-wiki.win/index.php/Is_SuperGrok_Billed_by_Apple_or_xAI%3F_How_to_Figure_Out_Who_Is_Billing_You_and_Get_Refunds_Right

If Apple billed your SuperGrok subscription, go to reportaproblem.apple.com to request a refund. You can also check your iOS Settings under Subscriptions to manage or cancel it, but remember canceling won’t automatically refund any charges