Another trick I heard of from my DD was to say when they asked for my DH to say to them "Sorry he's not available. Give me your number and I'll have him call you right back." They'll hang up.
Of course, if anyone is at home with you have them stand within earshot of the phone and have them yell, "'Honey, the baby's on fire! Honey, help". you hang up.
I have also acted deaf, which isn't far off, I have a hearing problem, but if you keep saying hello every few seconds, they quilt. Those usually don't call me back for some reason.
I've been on the list for no calls and it doesn't keep you from getting them. Just limits who can call. they also cannot call before 8:30 am or after 9pm. If they do, my DH who is very easy going guy, tells them not so gently that they cannot call at this time. Asks them all sorts of questions. They usually don't call back.