GoAir — My flight was cancelled by go air itself, and money is not refunded. It's more than 20 days

Address:	Mumbai City, Maharashtra
Website:	Go Air - Domestic airlines

Flight : chennai — hyderabad
Goair - g8-507
Pnr : 80knq4
Friday, 23 july, 2016.

Flight was booked via paytm and money has not been refunded yet.

My flight was cancelled and it seems that i got a call and i didn't answer.
Still there was no mail in my box regarding this. I wan my refund back at the earliest.
Its ridiculous on the part of go air that they give customer care number and never respond. Line shows busy 24x7!!!