Air Asia — Money refund

Hi,
Had a duplicate booking issue while booking my ticket from chennai to KL, means had 2 tickets delivered to me and i mailed the company reg,.this so they asked me choose a flight and i flew with the same. The other ticket they said they ll return the money..but even after their 31 days waiting period still no reply from them...and i keep mailing them..kindly help me to get back my money
flight details as below :

The following booking number should be refunded:


Booking number Q17UVR:
Mon, 12 Sep 11 Chennai- Kuala Lumpur 08:30-14:55
Sat, 17 Sep 11 Kuala Lumpur - Chennai 15:55-17:05
Regards,
Alfred