I've gotten several calls from this number. Twice I've answered a couple weeks apart. The first time I got a call it was from what sounded to be an American male (uncommon for call centers when most of our jobs are outsourced) He claimed to be from the CDC and conducting research blablahblah. I told him he was better off calling a scientist and refused to participate. Kept getting calls everyday after that. Second time I answered I got an American female, claiming to be from the Health Department. I asked her to stop calling. They can't decide on an agency to pretend to be. Don't give them any information. My number's on a do-not-call list, next time they call I'm going to ask for their address and write a violation letter to the Attorney General. The AG is pretty good about scaring the pants off of companies like this. The problem is that they'll probly just get a new number. I'd say 4chan your stories. See if anyone there gets an itch to help them loose your number.
Asking questions about personal information over the telephone is a HIPAA privacy violation. If this is a branch of the government, they should know this already. Do not give them any information.
How does they know the number of a individual? Will they work on saturday and sunday.I strictly doubt they are getting information from some place may be from search engine, hospitals or somewhere.