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

https://record-wiki.win/index.php/How_Do_I_Stop_SuperGrok_from_Auto-Renewing_on_iPad%3F

If Apple billed your SuperGrok subscription, go to reportaproblem.apple.com to request a refund. You can also check your subscription under Settings > [your name] > Subscriptions on your iPhone