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

https://wiki-nest.win/index.php/SuperGrok_Charge_Shows_Up_But_I_Never_Used_It,_Can_I_Refund%3F

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