If Apple billed your SuperGrok subscription, you can request a refund at...

https://qqpipi.com//index.php/If_I_Refund_SuperGrok,_Will_It_Cancel_My_X_Premium_Too%3F

If Apple billed your SuperGrok subscription, you can request a refund at reportaproblem.apple.com. Just log in, go to your iOS Subscriptions, select SuperGrok, and follow the steps to report a problem