I had a man knock on my door about two months ago. Asked me some questions about air quality and then said i would be entered to win some high tech air filter machine and that i would be contacted by phone.  Surprise! A week later i received a call from a woman who said i won.  Great, drop it at my house? Nope... it's such a high tech gadget that the guy needs to present a demo.
I scheduled for Saturday and get a call 40 min after the guy was supposed to be there, it's the same girl telling me the guy is running 20 min late.  When he showed up I didn't answer my door. The lady continued to call me during my work hours so I finally Googled the number and it belongs to NSTC. I Google that and it's a triangle scam.... sell x amount of crappy products and get your crappy product for free kind of scam. A few people had even taken the time to write bad reviews such as the person who does the demo leaving out hoses or clamps to the products and the company still charging for the item that was supposed to be an award in the first place One woman even writes they forged her name in her check.  

Just to clarify... All credibility was lost as soon as he said I could win this fancy humidifier.  

I digress, the lady had called me every other day since and I put one number on my block list about 2 weeks ago... now they are calling from this number.
Ugh.

Called several times.  I let the answering machine get it.  No one there.

This number has called my phones every day and no one there.

called me