Myntra.com — Received a defective product and they are not accepting the return

So i ordered a pink tokyo talkies dress from myntra few days back. I have been a regular buyer and I never faced any problem but this time when I received my product it was defective. Immediately i placed a return but the delivery boy isn't accepting it he says that myntra needs to approve the product first. I tried to speak to their customer care service but haven't got any problem resolved till date. This is very bad. I need my refund back. I didn't pay for a defective product. Also to mention all the tags are intact and the dress is unused.