Jet Airways — Ticket cancelled but amount is not refunded

Address:

New Delhi, Delhi

I did book my tickets on 1 APR 2015 from Delhi to Bahrain and Ticket Number is[protected], i cancelled the ticket at the same day due to some problem, I got refund receipt at the same time but till now I am waiting for refund its 21st APR now, they ask me to send a mail at [protected]@jetairways.com, i did four times and with in 5 days i didn't get any reply from them, every time i call them they say one of our senior person will look at your problem and will revert you but i am just waiting for any reply from their side, is there any solution or any way by which i can sue these and get my money.