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

https://instaquoteapp.com/why-does-apple-make-me-request-a-refund-separately-from-canceling/

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