You can request a refund directly from Apple by following these steps:
- Click the following link: https://expresslane.apple.com/GetproductgroupList.do
- Select "iTunes".
- Select "iTunes Store".
- In the next menu, select "Purchases, Billing and Redemption"
- Select "iTunes Store account billing"
- In the next menu, choose how you would like to continue your request with Apple.
Alternatively, you can use the 'Report a Problem' option on your iTunes receipt.