I'm so disappointed. I just bought a DVF dress from a seller on ebay and the dress was delivered yesterday and it's fake. It's missing the correct DVF label and side tag and it's not silk. I emailed the seller and told her I was very upset and I would not have paid $180 if I had known this dress was not authentic. She emailed me back and said I cannot return the dress and says it's not fake. What do I do now?