If Apple billed your SuperGrok subscription, visit reportaproblem.apple.com to...

https://www.booknose.win/to-cancel-grok-make-sure-you-do-it-through-the-same-channel-where-you

If Apple billed your SuperGrok subscription, visit reportaproblem.apple.com to request a refund. Go to Settings > your name > Subscriptions on your iPhone to manage or cancel, but remember canceling won’t refund past charges