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

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

If Apple billed your SuperGrok subscription by mistake, you can request a refund by visiting reportaproblem.apple.com. Navigate to the iOS Subscriptions section to find your purchase