If Apple billed your SuperGrok subscription by mistake, you can request a...

https://sierra-wiki.win/index.php/My_Apple_Subscription_Page_Won%27t_Load:_How_Can_I_Cancel_SuperGrok%3F

If Apple billed your SuperGrok subscription by mistake, you can request a refund at reportaproblem.apple.com. Go to the iOS Subscriptions section, find SuperGrok, and submit your refund request