If you emotionally must do something more, you could add to the dispute the information that the seller is Not A Registered User.
However, Paypal already knows that.
There is a slight possibility that the seller is having some problem and is honestly trying to solve it. Unlikely , of course, he probably is scamming. But for one example, sellers have a credit card on file with eBay to confirm that their fees will be paid. If the cc expires, the seller must update his information or he goes NARU.
That's an example of an honest if sloppy seller.
Don't worry. These scammers are few and far between and eBay and Paypal are pretty good at protecting buyers. There are a lot of transactions going on so the actual number of Disputes is very high, but the percentage is very low.
Your money may turn up in your credit card account rather than your PP account, by the way. Depends on how you paid.