Masquerading as an environmental survey, they reel you in by promising to enter your name into a "draw" and then a week later calling you to say you "won" $1,000 worth of coupons and set up a time to deliver them to your home at which time the person doing the delivery will show up and tell you that you'll get the coupons after he does his "demo" ... no demo, no coupons. It's a sneaky way of trying to get into your home to sell their vacuum cleaner or air filtration systems. Disgusting tactics!
Had to block them, they came around with a survey and say they are entering you into a drawing. Then they call and say you won a prize and want to show a demonstration when bringing it by. Said no thanks, they won't stop calling!