If Apple billed your SuperGrok subscription by mistake, visit...

https://riversinterestingthoughtss.wpsuo.com/how-do-i-stop-supergrok-from-auto-renewing-on-ipad

If Apple billed your SuperGrok subscription by mistake, visit reportaproblem.apple.com to request a refund. Go to your iOS Settings, tap your Apple ID, then Subscriptions to check your subscription status