All billing and refund issues are processed by Microsoft, so you will need to contact Windows Phone support for requesting refunds.
We would suggest you try the following:
- Visit http://gethelp.live.com. Please have your account and order number ready.
- Choose the category: “Billing + Payment (Store)”.
Scroll down to “Still have questions?” and click on “Contact us”.
- Choose “Chat” to connect quickly with a Windows Phone support agent.