Someone from this number keeps calling me at all hours of the day and night. There is never anyone there, sometimes there is a computer voice that says good-bye. When I try to call the number back I get a recording telling me that that number has been disconnected.
If you listen close you should notice that it takes a little too long for the "voice" to respond to your answers. I've run into this sort of thing before. Odds are that it's actually a computer following a script. Next time it calls answer the questions with something that makes no sense and see what kind of response you get. If it's expecting you to say "yes" or "no" in response to the question about your ability to get to a computer answer something that makes no sense at all. A human would know how to respond, the computer's response won't make any sense to you because it will probably skip to a default script or hang up on you.