Stephanie,
I'm so sorry that happened to you. I sell a lot of stuff on eBay and know they have Buyer Protection. There is a several step process you need to follow and there are guidelines as to when each step needs to be completed. Here is the website for you to look at:

eBay Buyer Protection

Hope that helps. It's so discouraging that there are people out there trying to make a fast buck by defrauding others. Good luck!