The person will call and ask for me by name.  I ask who is calling, get the name Tiffany from the lady on the other end.  I ask what the call is about and she puts me on hold.  When I call back, it is a verizon wireless cell number which is not in service.

I had a similar experience.  I called the number back and the number is dead.

I have had different numbers every day calling me for the past couple of weeks. I have only spoken to one woman, and I asked what her name is. She asked for me personally. I don't know how they are getting my number, but it seems like it has spread every where. I have gotten phone calls from hong kong, and every time on each number I can not call it back. They never leave a message.

several times noted on caller id, Who Is it?

This number calls me and never leaves a message. If I answer, they verify my name and then tell me they are an operator putting through a call and put me on hold.