This number has called many times, no messages left.

They are trying to get you to buy a filter queen vacuum, hence the 'air quality'

this number has called saying i won a prize for doing an air quality survey (which I vaguely remember) then that i have won a prize from a draw.  foolishly gave some information, when I called back to check got only a message and voicemail for general delivery box.  I do not get a good feeling--beware.