This number has been calling me non-stop for days and will not leave a message when I don't answer! Very frustrating.

If you receive a missed call from the following number: (02) 8458 2671 or (02) 8458 2672 then you have been called by McNair Ingenuity Research, based in Sydney. it may be because we were trying to contact you to participate in the NSW Population Health Survey, however we also conduct other surveys across Australia. See www.mcnair.com.au.
Calls are made to randomly selected landlines in NSW, as well as randomly selected mobiles across Australia. When we call mobile numbers for this survey we first ask you if you live in NSW, and if you don’t live in NSW we remove your number from our database of numbers to call for that survey.

its been the same with me they call at different hours of the day trying to contact me.. Thank goodness for number display

This is the New South Wales Population Health Surveys phone number:
http://mcnair.com.au/npop/

"If you receive a missed call from the following number: (02) 8458 2671, it is because we were trying to contact you to participate in the Population Health Survey."

Not sure how they got my number as I don't even live in NSW. Annoying.

ring and no answer or message left bloody annoying