Make sure you don't answer in any way to better your chance at getting them stopped. It's a live voice that's sought after, but as long as they get some kind of an answer, they're liabile to keep trying. If they're getting nothing from your number, they'll eventually get sick of calling it.
This person called asked for my husband by name.....when I asked my husband if he knew him, he said no. The man laughed and would not give me why he was calling. He called on my cell.