To request a refund:
Click on this link: https://support.google.com/googleplay/answer/134336?hl=en and you should be able to start the refund procedure. If you are having any difficulties with it, you can always contact us to assist you or you can contact Google Play Support.
If you choose to contact us for help with your Google Refund please be sure to include the order number for the purchase you would like refunded, your support ID and the email address that is linked to your Google Play. We need each of these pieces of information in order to process your refund.
You can learn how to locate your support ID by going here.