Flipkart — Received Defective And Used Product

I had Ordered Boult Earphones From Flipkart, I received product Used And Defective Product, I Initiated The Return Request Immediately After I found Out.
But The Flipkart Agent, Refused The Return Saying I Have To Talk to the customer Service Again.
I Was Notified through SMS that the reason For Rejection Of Return Is Product Mis-Match.
Was The Agent Blind, The Product Is Exactly Like The One In The Package but defective.
i need help ASAP Please.
Regards