left no message

Someone from this number called and I answered.  They asked for my voice mail and when I said they were speaking directly too me they hung up. When I called the number back a message says the number is not in service.

they keep calling my line as well.. but instead of a message all i get is a BEEP. they've been calling the last few months on average once a week, and that is just my office line, who knows about everyone else.

no message

This number have been calling us every day except weekends for over a monththe few times i've anwered without checking the number first the line was open but no one would say anything.  Just weird.  They call everyday and hang up just before the call gets to the machine.