When they call you by law they can't hang up. Unless you start to be profane. I have the phone to my little cousin about a week ago when some guy tried to sell me some computer and he just kept on talking and talking.
"HELLO SIR, I WOULD LIKE TO OFFER YOU A ONE TIME DEAL ON......."; I DON'T KNOW WHO YOU ARE. IF YOU EVER CALL ME AGAIN. I WILL LOOK FOR YOU, I WILL FIND YOU AND I WILL KILL YOU.