I have received dozen phone calls, irregularly spaced out from a few days to weeks or even months, but most of those I initialy engaged where from what sounded like an overseas (Indian?) call centre(s) that relayed me to the original caller or one of their associates: (DialPort.com, an online PC fixing service I used once but will never allow to access my PC again). They either ask to access my PC for a periodic remote session, or refund me an excess payment. Is this operator already on the "'user-beware' list you circulate. If not, it should be. What's important to note is that these initial contact numbers are not the suspect's number(s). They are land lines numbers probably selected by the suspect's contact working within that call centre, and used without the owner's awareness. But you may like to follow up and test the original caller for yourselves, first. Cheers and good work.