Ebay.com — Second hand of iphone 6/defective/duplicate headsets/mic not working properly

Address:	Chennai, Tamil Nadu, 201010
Website:	www.ebay.com

I purchased an iphone 6 in the third month of this year on 27th. After using it for a while i realized that the mike of the phone is not working up to the mark as i got voice cracking complaints from my friends being on other side of the line, one side of the headset is also not working, so i planned to get it checked from apple store, they told me with proo[censored]sing emei number that its a second hand phone purchased in usa in october 2014 plus the headsets are also duplicates. Ebay seller is not taking any responsibility infact they are not even taking the responsibility of getting it refunded or replaced, they are asking me to courier it to them and they will see to it but not replace or refund. Its a total fraud case and i am scared that if i will courier it to them then they gonna keep this phone and my money too.
Please help me.