GoAir — Flight Cancelled - No refund received

I had booked a flight from Mumbai to Jaipur and Jaipur to Mumbai from go-air. We received a mail stating that the flights are cancelled and a number was provided to us for seeking refund. That number is always unreachable and we have not received any refunds from the company. None of their customer care is working. This is really the worst experience ever. They should without any complains resolve the matter on their own.