I work at a school and this number calls daily, sometimes more and when you answer, it just hangs up. I called back and it was some publishing company for a magazine. She didn't have my number listed of course, but claimed she would put me on the 'do not call' list. We will see!
Answered call - subscription company wanted to verify address, name, email address they had on file. Then, proceeded to go on and on with more questions, so I hung up. They have been calling my work multiple times a day now!