I bought a couple gift card codes from eBay not knowing they were from the Australian store. So I can't use them in the U.S. iTunes store. I told him about my problem but he refused to give me a refund. How can I use these codes? If I use them in the Australian store, can I still download and play the music? What is the difference between the U.S. and Australian stores? Can I use them to download apps from the App store?