I was called on my direct line at work from this number and answered only the name of the firm where I work and my first name, at which point the man asked if I was Susan (Insert My Last Name Here), at which point I answered yes.  He said thank you and hung up.  I don't understand what his purpose might be or how he could be trying to sell me something based on that information.  I also don't know how he could know my last name since I don't believe my direct dial line at work is published anywhere.