get rid of them: telemarketers
When getting calls from telemarketers, don't lose your time asking them their names. They probably are Johns or Davids and Marys or Janes, it just depends on which section they sit.
To get rid of them, you have two possible answers: Or you say straight "I'm sorry I'm not interested" and hang up the phone, or, if you don't want to be so rude, you can always say "I'm quite busy right now, but if you give me your home number I call you back at dinner time."