Indian Railway Catering & Tourism Corporation [IRCTC] — non receipt of refund against cancer of 5 tickets

I have not got refund amount to the tune of more than ₹.6000, /- against cancellation of 5 tickets although more than 2 months have elapsed since the tickets were cancelled. I have sent several mails to irctc in this regard, but they did not hear any fruit. Irctc is sitting pretty on my refund issue. Instead of settling the long pending refund issue, irctc allots new ticket ids whenever i send mail to them on refund issue. It is highly reprehensible. Will you admonish them to settle the refund issue as early as possible. I have already provided ticket details along with copy of my bank passbook as sought for by irctc.