In app purchase charged but not received
I used my iTunes gift card to purchase an item in a game called Clash of Clans.I entered my password and waited a long time for my purchase to be done. But I closed the app accidentally and as I opened the app again I can't purchase it because my credit had been charged. Then I received an iTunes receipt one day later but I still didn't get the item. I tried to contact the developer and send a feedback to iTunes Store but neither has a response till now.
iPhone 5s, iOS 7.0.4