You didn't provide any evidence that the charge was fraudulent. If they have a tracking number you gotta provide something, at least a police report.
Also you likely filed "merchandise/services not received" when you should have filed "unauthorized transaction". Even if you really did get the item, you don't have to pay for it if it was ordered by someone else using your card.
Honestly the only thing I had was one tracking number was generated an entire day before the supposed purchase, the 'pirate' email address (they were taunting me), that the religious items purchased were not of my religion, and that ebay had closed the scammer account. But my bank was not interested in taking on ebay. To the scammers credit, by creating both the buyer and seller account they made their scam a lot more resistant.
Also it was charged back as fraud. I had other fraud transactions that day and my bank reversed them. They were too scared to fight ebay or something.
I've learned proving a negative of "prove you didnt buy this" is pretty hard and thus fraud protection is more of a facade that only kind of works.