Indigo Airlines — Money refund denied despite of buying a refundable ticket

Address: Bangalore, Karnataka

I had bought a ticket from Bangalore to Kolkata on 17th March 2015(5:20 PM) and the flight was supposed to depart at 6:40 PM. The PNR No being-057LSF, Flight No-Indigo 6E-378.I reached the airport at 6:10 PM. I was denied a boarding pass. I was denied a relocation.and finally I was denied a refund. They said cancellation has t be 2 hours prior to departure. In my case, I bought the ticket 1 hour 20 minutes prior to departure so how will I cancel 2 hours prior? As it was an emergency situation(my grand mother in law expired), again I bought a ticket with Indigo, PNR No-E3W5FV, flight No-6E-339 on 18th for 19th(6:30 AM) Want a refund for the same..