I get calls from this number at least 3 times a week. I think one of these times I will tell them to come on out to clean my carpets and then once they arrive and I find out who sent them, tell them to forget it. Maybe if they have to spend money and don't make any they will find a better way to do business!!
Not sure if it would help, but I've heard other posters say they have gotten the license plate off of the truck that shows up as further information to report to the authorities. I wonder if that extra tidbit has ever helped prosecute these types of fools, though.