This number has called me some also. Leaves no message. I called and they answered and asked for me but hung up. If they can't answer with a name of company or whatever forget them..
They called and left NO message. I called it back and they asked for me. When I asked who they were, they did not answer right away. When I pressed the matter they said they were the "academic degrees online". When I told them to stop calling me they hung up on me.