I pick up the phone, and the person (a lady) on the other end asks who I am EVEN THOUGH they are calling me.  I give them a first name only because I am confused.  They make some story up that I called them first, and that they were returning my call, which is entirely untrue; hardly anyone uses the phone line at my house unless it's to speak to relatives or friends.

I am fairly certain that I have heard from these people before, and that they asked for someone named "Gwen."  Annoying for now, possibly a scam in progress.