I bought a mobile phone off eBay an hoping someone can help me out.?

[Jamie B]

I bought a sony ericsson w810 for my dad for fathers day. When i read the description it said nothing about damage but did say it was 'used'. I got the phone through the post today and checked it out and it is really damaged (chips to the side, part of the logo missing, scratches all over the camera mirror) so i want to return it to the seller. I contacted the seller today saying I'd like to return the phone and would like his address so I could post it for him but he refuses to give his address as he has a, bought it... now deal with it kind of attitude. Just wondering what I can do and do i have the right to ask for a refund. If I do have the right what can I do if he refuses to give a refund. Thanks