Air Pegasus — Refund of cancelled flight done by Air Pegasus

Address:	560102
Website:	airpegasus.in

I had booked a flight from GOA to BLR on 19/7/2016 with PNR no. IMQL1Z for date of travel being 17/10/2016 which was cancelled by Air Pegasus. Uptill now I have not received my refund nor any details about when the refund would be made. All incoming calls to the customer care numbers have been debarred, hence we cannot call and inquire as well.
I would like to know what best can be done against the airline to receive my money back.