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

https://garrettsbestblogs.theglensecret.com/how-do-i-cancel-and-refund-supergrok-if-i-have-both-iphone-and-ipad

If Apple billed your SuperGrok subscription by mistake, visit reportaproblem.apple.com to request a refund directly from Apple. Remember, canceling your subscription in iOS Settings under Subscriptions stops future payments but doesn’t refund past charges