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

https://www.bookmarking-maze.win/if-you-were-charged-for-supergrok-and-want-a-refund-first-double-check-who

If you want a refund for SuperGrok, first make sure Apple actually billed you by checking your purchase history or iOS Subscriptions. Remember, canceling the subscription won’t automatically give you a refund. To request one, go to reportaproblem.apple