Just send them an email with both your booking numbers, they'll refund as long as the passenger's name is the same.

Here use this, it's much faster: https://eform.airasia.com/

What happens if I make a double payment or double booking?


Our systems will not allow you to make the same booking (same name, same payment method, same flight date & time) within 24 hours.

However, if you use a different payment method or you accidentally make the same booking after 24 hours it will result in a double booking (two tickets with different reference numbers). If that is the case, please click this link and fill up the e-form to request for a refund: in "Case Category" select "Feedback" and in "Type" select "Website Booking/Check-In";. Fill up all mandatory fields marked with an "*". You will need to provide the reference number of both of your bookings.

This post has been edited by JCogent: Mar 20 2017, 08:18 PM