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

https://wiki-zine.win/index.php/Why_Is_My_SuperGrok_Subscription_Still_Active_After_I_Canceled%3F

If Apple billed you for a SuperGrok subscription and you want a refund, visit reportaproblem.apple.com to request it directly. Canceling in your iOS Subscriptions settings stops future charges but doesn’t refund past payments