Air Carnival — Refund not made

Air carnival — non-refund of canceled flight

I had booked a flight ticket for my family of 2 members in air carnival flight to travel on 27.04.2017 from chennai to tiruchirappali. They messaged as the flight was canceled by them and mailed me that the refund process had been initiated on 17.04.17. Even after 1 month had gone the refund was not made. To my repeated mails they are telling that they are checking. From the face book of air carnival i came to know that there were more persons had been affected like me.
Find below my ticket details:

Kindly take necessary steps to sue the company and to help us to get the refund from air carnival.

Regards,
Bari