I got a call from these hucksters on my cell a week or two ago. Seemed like an obvious scam so I just hung up, made an annoyed comment to my wife and forgot about it. But apparently I'm not alone:
Beware the scam phone calls announcing, "You indicated you were interested in a position in a survey."
I suspect the calls are actually automated - the pauses were unnatural and even the voice seemed artificially flat to me.