Annoying calls.  Won't leave a message but keeps calling around the clock.  If you call to see what they want and/or why they keep calling but don't leave a message, you get a recording they are doing a study.  Unprofessional sounding voice.  Sort of sounds like the voice is retarded or from a very very "slow" person.

These people have been calling every couple of days (5 times so far) and reportedly are doing a "survey".
I have asked them a couple of times to stop calling, and today the woman practically laughed at me when I told her my number is on the 'Do Not Call' registry. She claims that surveyors are not restricted by the DNC list, and seemed glad when she proceeded to tell me that they will continue to call, even if I don't want them to.
Very rude!

Call came in a 4:53.  Woman caller says "Is this a business?"  I said Yes, and she replied, "thank you" and hung up. This is the second time she has called.  The first time the phone only rang 3 times and I did not get to it in time & they did not leave a message.

I receive about 4 calls a day from 617-729-0938.  I never answer my phone and they never leave a message.

I am being continually barraged with calls from this number too.

I don't know what to make of this, but here's what I found in a "reverse look-up" search:

Winchester Hair Salon For Men
34 Waterfield Road - Winchester, MA
    
617-729-0938    

Winchester

Knowledge Networks is a nationwide telephone survey company. They sent me 2 cards in the mail, one with $1 bill and the second with $2 bill as a small way of saying Thank you.

Same as Paul, they called me and told me they were going to mail me a $1 so I can take their next call, which was going to be a survey.  I guess they feel since they're paying you that you're obligated to take the call.