GoAir — Non refund of money against cancellation of the flight

Address:

Mumbai City, Maharashtra, 400069

I have booked a flight ticket from mumbai to kolkatta (g8-339/228) on 4/7/2016 having pnr no. ppmd86. i booked the ticket on 2/7/2016 through credit card but on 3/7/2016 i received a message conveying me that the flight is cancelled due to maintenance problem. i called the customer helpline and asked him to refund me back my money. he told that it will be credited to my account in 7 working days but til date i haven't received my refund money. now whenever i try to call the customer helpline no. they don't pick up my call. this is a total lack of irresponsibility on the part of goair services. i just hope they refund me back my money at the earliest as possible.