Bookings through Agoda.com

A booking was made and paid for. A few minutes later it was cancelled and since then, they looking for all excusses not to refund me. They claim the reference number is wrong or my e-mail used is unknown, but they keep responding to the one and only e-mail always used. Every time it is another consultant that respond with the same excuses and apologise for the inconvenience. They just refuse to refund the payment.