Samsung Galaxy Y Duos Gt - S6102 - Strong Black Smartphone — Item not as expected

Address:

Chennai, Tamil Nadu

I had ordered Samsung Galaxy Y Duos GT-S6102 but to my shock,I have received(on 12/04/2013) Samsung Galaxy Y S5360 which is of lower grade and features. Then, I contacted the seller, from whom the package came, who is saying that replacement will be a difficult one, Hence I contacted the eBay customer care and insisted them to get back the product and refund the amount(Rs.5499).
They replied that eBay will take action within 48 hrs.I was told to submit a claim application in eBay. I did filled up the application and submitted on the same day(12/04/2013). But till now I didn't get any calls from eBay.Every time I called eBay customer care, they would say "the claim action is under progress and it will take 48hrs within which a representative will call you Sir". But till date no one has called.
Today(17/4/2013) when I called back the customer care, they say that it will take 20 days to do all this refunding process and are not taking responsibility for the mistake that has happened. They say the mistake is on the seller's end. I am asking who is the seller?- he is the one authenticated or appointed by eBay only and why the hell should I wait for 20 days. For that eBay says- "It is clearly return in the Terms & Conditions that it will take 20days for refunding".

Its total bullcrap. Please dont not purchase any product from eBay.You can go ahead if you have to take the chance.