To get a refund for SuperGrok billed through Apple, go to...

https://garrettwigp625.tearosediner.net/supergrok-refund-request-what-should-i-say-in-the-comments-box

To get a refund for SuperGrok billed through Apple, go to reportaproblem.apple.com and sign in with your Apple ID. Navigate to iOS Subscriptions, find SuperGrok, and request a refund