IRCTC (Indian Railway Catering And Tourism Corporation) Limited — TDR Refund

Address:

Hamirpur, Himachal Pradesh

Sir
I had booked a railway ticket from IRCTC on 19 sep 2012. But I had not travelled as my exams were cancelled.
So I had filed TDR (Ticket Deposite Receipt) with reason "Passenger Not Travelled" for PNR Number: [protected] on 6 oct 2012. As per the Extant Railway Rules I should have been refunded half of my total ticket charge within 90 days of filing TDR.My total ticket charge is Rs. 600 but I was refunded only Rs. 75. I have complained to IRCTC twice on email :" [protected]@irctc.co.in" on 11 jan 2013 and 17 jan 2013. In response they said,"We would like to inform you that your below enclosed email has been forwarded to the concerned department.You will receive a reply in this regard shortly".But niether I didn't get any mail further regarding the matter nor any progress in my refund. Even after talking on IRCTC helpline[protected] there is no progress in my refund. I am not getting any trustable response from IRCTC.
So please help me.