Amazon — i had got faulty product, from amazon and they didn't refund for it.

Address:

Pune, Maharashtra, 411062

I had bought boat nirvanaa uno earphones from amazon which i got on 15 october. But that product was so poor quality so i requested them for return on 16 october. But till now there is nothing updates from amazon in spite of that i had called them 100 of times but their customers service didn't done anything, they just told from my first call that to wait just for tomorrow we will pick up your order.
And customers services telling me that to ship your product by your own with your own money and then we will refund your money so please tell them that these not my work it's yours.
This is very poor customer service i have ever got from amazon which any customers doesn't want.
So please solve my problem as soon as possible and refund my money.
Thank you.