Go into your Settings > Your Name > iTunes & App Store
Tap your Apple ID at the top of the screen and choose 'View Apple ID'
Tap Subscriptions > Funexpected Math!
How could I get a refund?
As Apple handles all payments for our app, you'll, unfortunately, need to appeal directly to them for a refund. Here you can learn how to do it. We wish we could be of more assistance, and are terribly sorry for the inconvenience.
How to check if the Limit Ad Tracking setting is turned off?