Have you tried calling ebay and telling them what happened? They will almost always side with you as the buyer.
Sounds like you did nothing wrong and shouldn’t be afraid to let them get the police involved. I’ve had a few deals gone bad, and have always called. Most of the time, ebay steps in and I get my money back. One time the seller ignored all communication from ebay and me, so I got my money back AND got to throw the item in the trash myself!
“My job? Boilers and toilets, toilets and boilers. Plus that one boiling toilet. Fire me if you dare.”