See who's calling

First call is automated asking for first name of person, "Is xxx there". I hang up call back and the person says, "xxx filled out paper work for cancer screening" when this person there calling for did no such thing. They were rude & say there are a part of a program. I don't believe them so I told theme take this number off of your list & blocking them. I do know as far as I can tell from the back ground (hearing others talking) it is telemarketing. So if this number call you hang up.