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

https://spark-wiki.win/index.php/If_I_Refund_SuperGrok,_Will_It_Cancel_My_X_Premium_Too%3F

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