Jet Airways — jet airways not, responding for refund after complaint 1 month finished

Jetairways not responding for refund, after complaint 1 month finished
My complaint i repeat as below

I got my e-ticket no[protected] booking reference (Pnr) silmxa
From doha (Doh) to kochi (Cok) in jet airways the ticket was purchased by online on 21 may, 2017..
On[protected] i amended my flight and date of booking and i paid 310 qataririyal. Unfortunately my ticket not updated at system. I asked customer care on the next day. They informed that money will be refund within one week. To change again please try again. Then i changed at[protected] with 400qataririyal. I got my new ticket no.[protected]. Ok comfirmed

But still as per my bank details my first 310qr refund not received from jetairways.. So please help me and check your documents about my refund..

Thanking you