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

https://blogfreely.net/samuel-wang09/i-used-a-family-members-apple-id-for-supergrok-how-do-i-refund-it

If Apple billed your SuperGrok subscription and you want a refund, visit reportaproblem.apple.com and sign in with your Apple ID. Go to iOS Subscriptions, find SuperGrok, and request a refund