Michael Price spam

I have received many spams that trace back to a Michael Price. Quick web searches of "'Michael Price' spam" and "404-592-9904" confirm that I'm not the only one. Here's an example.

They repeatedly ignore my requests to stop spamming me.

All of the spams show an address of either:

600 North Park, 17th Floor
Atlanta, GA 30328
or
600 Northpark Building, 17th Floor
Atlanta, GA 30328
or
1200 Abernathy Rd, 17th Floor
Atlanta, GA 30328

Possibly related domains include:

There is a BBB report on BizSummits/bizsummits.org. It lists 9 complaints as of June 2013. The BBB rating is F on a scale of A+ to F.