I strongly recommend reading "I fought the PayPal and I won", https://news.ycombinator.com/item?id=33462658. If you feel you're in the right, you should study the eBay user agreements, figure out your options, and exercise them.
You made a post an hour ago and within 29 minutes provided an update that it was resolved. How much easier can it get?
I guarantee you this is what happened; it literally happens all the time with people here.