Hung up when I picked up the call. My guess is a robodialer going down a list of local numbers to see which ones will answer. Either no live person was available at the call center or my number has been put into a database so a live person can call back later.

I'm on the donotcall.gov list since 2011 so if it's confirmed as a marketer not excluded by the FTC than the procedure is to file a complaint (888-382-1222).

I answered the phone and there was a long pause then a guy said, "we are calling in regards to the online survey you filled out."  I immediately told him I did not fill out a survey and hung-up

This unknown caller called my phone again.  Would like to know how they got my number, being that it is a restricted limited official use number.

Received call from this number this morning, Feb. 21, 2013. I picked up and clearly said "Hello." Robo dialing was waiting for me to say something again to confirm the call was connected. Don't answer.

I also received a call from this number this morning, 2-21-13.  I answered and it was a guy stating that he was calling in regards to an online survey I completed for Walmart, of which I stated I was looking for a job.  I told him that I hadn't completed a survey and that he must have the wrong number.  He said ok, then I hung up.  

I called back from an anonymous number, received a recording stating they are WN Positions and that while recently online, I indicated I was interested in employment opportunities.  The recording further stated that they are a leading career placement agency.  I am thankfully employed and haven't searched for a job nor completed a survey.  Not sure how they obtained my number, but hopefully they won't call me again.