www.MakeMyTrip.com — Refund not provided on cancellation

I booked 4 bus tickets from Pune to Goa on 9th jan 2010 worth Rs 2400 via www.makemytrip.com. On 14th jan, I receive a mail saying vendor can cancelled the booking and refund process will be done and money will be transferred to your bank account. That day, I receive Rs 150 only in place of 2400.
I've called the toll free number several times, every time they say, refund will be done in the next 48hrs but its never done.
Please help me recover my money.