I've been getting calls to my cell phone for at least a month--sometimes 2 or 3 times a day.  Sometimes I don't answer the call.  Sometimes I do.  they never leave a voice mail.  There's never been anyone on the line until today.  She asked for my son by name (as far as I know, she didn't know we were related).  I told her she had the wrong number.  She asked if I knew him, would he be available this afternoon for some sort of paperwork.  I asked who was calling and she wouldn't say.  So I played dumb.  She persisted, asking if I had contact with him, etc.  I asked again who she was with.  She didn't say.  She asked for my son's number and I told her good luck getting it and hung up.  Later, I called the number and got a recording that the number I called is not a working number.  Do I smell a scam here?