If you want a refund for SuperGrok, first make sure Apple actually billed you...

https://www.bookmark-friend.win/to-cancel-grok-properly-make-sure-you-do-it-through-the-same-billing-channel

If you want a refund for SuperGrok, first make sure Apple actually billed you by checking your receipts or subscriptions on your iPhone. You can view and manage your iOS subscriptions under Settings > Your Name > Subscriptions