Hi again Norm,
Personally I would try and do a refund claim like I've done as it's pretty evident of what's happening with all that sudden negative feedback.
In the reason for refund box I would simply explain that you suspect this seller to be a scammer as no tracking information was supplied. This was one of the reasons why eBay fully refunded me. This fact is what they gave for their actual reasoning for giving me the refund.
That account you bought from was groomed with glowing feedback for some time to give it some credibility and then they applied the "BIG STING" and cleared out with all the cash, thus why no one has received a reply after 20 attempts of contact etc.
Cheers,
BB.