i picked up the phone and no one said anything.

Recorded call   talked about an online survey.. I did not complete an on line survey  .
I am registered with do not call. What is going on with that?

No message left...just an irritating call from an unknown caller.

Computer, I'm sure.  Should be against the law.

I answered, and after a brief pause they started talking about an online survey related to java (I'm a java developer). When I said "what survey?" they said "a survey you filled out online, do you remember?" When I said "what survey?" again, they said they're a recruiting firm. I did not fill out any survey and I'm on do-not-call registry. so I hung up. It's an automated system playing recordings, but it's very cleverly done, and almost fooled me.