If you want a refund for SuperGrok, first make sure Apple actually billed...

https://star-wiki.win/index.php/How_Do_I_Use_Reportaproblem.apple.com_for_a_Subscription_Refund%3F

If you want a refund for SuperGrok, first make sure Apple actually billed you—it might show up in iOS Subscriptions. Remember, canceling the subscription stops future charges but doesn’t refund past payments. To request a refund, visit reportaproblem