Did you try contacting Liquidation.com? We used to sell on that website, and although they have an inspection period of 48 hours, when it comes to the authenticity of an item they may make an exception and alow you to dispute past that time frame.
I will say this though, there are plenty of reputable sellers who sell name brand clothing, but you should try to stay away from large lots of new brand name items like Ed Hardy, Gucci, Prada, and other extremely high end items. These type of designers generally don't liquidate off large lots of those brand names, so a lot of those items floating around on the internet are fake. Now that is not to say you can't get them within department store lots mixed in, but usually not in high quantity, or at a low price.
If you are interested in name brand clothing. Try visiting our website. We have many different types of lots liquidated directly from U.S department stores, so authenticity will never be a problem (we have documentation of authenticity for any item contained in one of our lots). We also have great selling brands too!
If you need any help with contacting or making your case with Liquidation.com though, please fee free to message us as we were sellers with them for a couple years and I know the in's and out's with that company pretty well.