HappyEasyGo — Not refunding my money

Address:

Plot no. 242 & 243, Phase IV, Sector 18, Gurugram, Haryana 122015

I booked 3 tickets for the same airline from happyeasygo and canceled the same. For 2 tickets i got the full refund and for 1 more ticket they aren't refunding the money.. whenever i call they don't pick up the call or when the did pickup the call they say wait for 3 days you'll get the refund.. it's been more than 5 months and i still haven't got the refund. It's clearly written in their terms and conditions than you will get the refund after 10-15 days and it's been 5 months..