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:

  1. Visit http://gethelp.live.com.  Please have your account and order number ready.
  2. Choose the category: “Billing + Payment (Store)”.
    Scroll down to “Still have questions?” and click on “Contact us”.
  3. Choose “Chat” to connect quickly with a Windows Phone support agent.