Problem with Auction house

[Stanesq]

I won a lot of cards from CSauctions, a 1970 Topps lot of 565 different autographed cards. Before the auction, I reviewed the lot over the phone with an employee so that I would know what deceased/tough cards were included in the lot. When I received the lot I received 3 unsigned cards which I was told were included in the lot, Jim Hardin, Zollo Versailles and Jim McGlothlin. I called the auction house who now is refusing to take the lot back. I asked Steve Verkman to either send me the signed cards or take the lot back. He said he will look for the cards but he is not hopeful of finding them and that he definitely wont take the lot back. He said to him its $12 worth of cards based on the hammer price of $1800 and because those players were not specifically mentioned in the catalog he has no liability, despite the fact that his employee told me and others who called that the signed cards of those players were included. How should I handle this?

St,an Pietr.uska