To get a refund for SuperGrok billed by Apple, visit reportaproblem.apple.com...

https://blogfreely.net/samuel-wang09/i-cant-find-the-supergrok-invoice-number-where-is-it

To get a refund for SuperGrok billed by Apple, visit reportaproblem.apple.com and sign in. Navigate to your iOS Subscriptions, find SuperGrok, and request a refund there