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

https://www.4shared.com/office/3rwv2w8_ge/pdf-73301-13539.html

If Apple billed you for SuperGrok and you want a refund, visit reportaproblem.apple.com to request it directly. Remember, just canceling your subscription in iOS Settings > Subscriptions won't issue a refund automatically