The next useful piece of information I receive from one of these sites will be the first.  Here's the deal guys; they'll hang up unless you play along. If you DO, you can actually find out who they are and do something about it.  I've yet to see a single person figure this out.  Only reason I come to these sites is a futile effort to see if someone actually had the brains to suss them out, in cases where I missed the call and am researching the number.  Never mind.