Jiomart — Missing items refund not received

I have ordered 4 dresses but got only one. That’s why I returned it as suggested by delivery agent. When I returned the one dress which I received, on refund details it was showing refund amount for 1 dress only. But I paid for 4 dress amount which is 1526. From last 3months I am sending mails every week, taking follow ups but no outcome.