I've actually received several calls of this nature - on my business cell line (which is posted on my web site). The individual on the other end alleged that I was "not receiving updates from Microsoft" and asked if I were aware of it. When informed I did not own a Microsoft computer (I develop on Macs), he or she terminated the call.
I Googled the phone numbers. They've been reported several times, to no apparent result. Now, they've started blocking their numbers on the caller ID.
Not too impressed with the FTC's guardianship.