This company identifies themselves as Survey USA; they robo-call every few hours repeatedly and are very annoying.  Their web site says they conduct various types of "polls", but they offer no way to opt out of their calls on the Web Site and if you call them back, they are never available.  While one can imagine they might possibly be legitimate, their failure to offer an opt out is more suggestive of someone with less integrity than one could hope for.  

They called my company so I answered with our greeting. After saying the greeting twice, they hung up. I guess they will hang up if they call a company since they aren't their bait. However, another phone number that called (look out for 7015579150) kept on calling me. Eventually I figured it out and hung up when they called and so far they stopped calling. I'll write this number down and hang up on them as well. I also assume they are the same survey people that JE mentioned.

Caller ID says SURVEY USA POLL. No voicemail left.

Called no message. Sick of this crap. Same survey people probably

This number has called twice in the last few days.  They don't leave a message, don't know what kind of survey it is.