Received these calls before and no message left. Today I answered and the conversation went like this.
Me: Hello
Harasser: (pause) Hello
Me: Who is calling please?
Harasser: My name is Adam. I am with the Government and am doing a labour survey.
Me: (knowing this is not professional) Which government department are you with?
Harasser: Government of Newfoundland and Labrador.
Me: And what department in the provincial Government?
Harasser: The CRA
Me: What department is that?
Harasser: The Canada Revenue Agency.
Me: You are with the CANADA Revenue Agency, yet you work for the Provincial Government? I don't think so. Goodbye. (click)

Just got a couple of calls and no one was there.  No message left when I didn't answer.

I keep getting calls as well w/ no messages. Their driving me crazy as they call often, I'd like to know who the heck it is

I keep getting calls from this # too. Why can't we find out who it is?? Nobody answers when I pick up the phone. I do recall getting a call regarding a survey. I wouldn't do it. May have been the same #.

Just got the same call a few times and no one there of course!!  Pisses me off, grow up and get a real job!!

yep. We've been receiving calls from this number as well, with no response on the line, when i do decide to answer. Very annoying!