If Apple billed your SuperGrok subscription and you want a refund, go to...

https://mega-wiki.win/index.php/What_Should_I_Do_If_I_Subscribed_on_Grok.com_but_Tried_to_Refund_on_Apple%3F

If Apple billed your SuperGrok subscription and you want a refund, go to reportaproblem.apple.com and sign in. Choose iOS Subscriptions, find SuperGrok, and request a refund directly there