Got a call, I didn't answer because I was at work. When I called them back there was a message telling me this number had been disconnected but I am still receiving calls

Call no message

I have been called twice now, while in school. Each time, there is no message.

Called me on my CELL phone.  Very professional-sounding woman told me a well-rehearsed spiel that the new laws will reduce my auto insurance premiums and mentioned State Farm? and Allstate.  Was evasive when I asked what company she was calling from.  Said she just wanted to ask a few questions.  Asked if my car was insured and what company I used.  I again asked what company she was calling from and she again said I might save money, was I was interested.  I said no, and then she said, thanks, good bye.  Called back and got a recording from the phone co. that this is not a working number.

SCAM!!!

Also, when I answered and said hello, there was quite a pause before someone spoke.