How to get a refund for an app you purchased from the Apple App Store App Store Downloads on iTunes
If you have purchased an app from the apple App Store accidentally, or if the app isn’t functioning as well, or if you are experiencing technical problems with your app, you can request for a refund from Apple.
It is possible to obtain a refund on items purchased within the past 90 days, Lets give you step by step instructions,
Quick link https://secure2.store.apple.com/us/order/list login to your apple account, click the Report a Problem link available against the app you are looking for refund, now it will redirect you to report a problem window here you can specify the reason for which you are looking for refund.
If your app is eligible for an immediate refund, you’ll see a “Refund issued” right away and the refund will be processed in 5 to 7 days. In case if it is not, then someone from the Apple support team will contact you within 48 hours via the email resolve your request.