I've gotten these calls a few times as well. Luckily my business is listed with my P.O. Box not my physical address. So I gave them the physical address of the giant Post Office where my mail comes. I think they're selling credit card machines. To bad their salesman will standing in the lobby with no one there to meet him.
Very quickly, "Hi, this is Matt. Is the owner of the business in?" Told him yes but he was on the other line...2 seconds of silence & he hung up. Called number back...Cresent Processing. Got recording as if I was interested in signing up for this crap. Left message with # stating I wanted to remove our numbers before they started annoying me daily. We'll see what happens. I'm sure since they have more numbers they are going to call more often now. Joy.