Irctc — TDR not refunded even after more than 4 months

I have booked my TDR against my ticket(PNR no. - [protected]) on 10th of October 2009 as the train was late by more than 3 hours. But still I didn't get my refund.
No. of times I have send mails and called IRCTC customer care. I got same reply every time that they don't know the exact time of refund.

After so many days, lastly today I got one mail from IRCTC, giving excuses as:

Dear customer,

Sorry for the inconvenience. Kindly note that your refund case of PNR No. [protected] has been forwarded to CCM/NER Railway on dt. 22-oct-2009. Refund yet not received from concerned railway, so we are sending a reminder with all the papers pertaining to your refund case to concerned railway on dt.17.02.10 to chase up the cases. As soon as refund, if any, received it will be credited to your card account.

I couldn't understand,what are the processes that IRCTC is doing that takes too much of time?
Nobody is there who really can take care for all these happenings?
Or, IRCTC wants to earn more and more interest from customers money?

Thanks to do nothing.