iOS Users
We unfortunately cannot process refunds ourselves as Apple handles the payment system. You can request a refund directly from Apple by using the link in the payment receipt you've received by email. Additionally, here's their support page:
http://www.apple.com/support/itunes/contact/
Google Play Users
Refund requests for transactions made on Google Play are processed by Roofdog Games. If a transaction was made that you did not authorize, contact us using the "Submit a request" link on this page.
Amazon Users
We unfortunately cannot process refunds ourselves as Amazon handles the payment system. You can request a refund directly from Amazon.