If Apple billed your SuperGrok subscription by mistake or you want a refund,...

https://www.adirs-bookmarks.win/to-cancel-grok-correctly-use-the-same-billing-channel-you-signed-up

If Apple billed your SuperGrok subscription by mistake or you want a refund, visit reportaproblem.apple.com. Log in, go to your iOS Subscriptions, find SuperGrok, and request a refund there