Hung up once in voicemail

Lisa with credit card services

this call was a great demonstration of technology; you would almost think it was a person;
getting around DNC by calling it a survey; but the machine wants to sell home security

No message left. 3 calls today.  Wasting their time because I don't answer unknown calls.

Spoofing to make it look like a local number.  When you say "Hello" the caller says, "Hello, this is so and so, can you hear me?". It actually sounds like a real call until it goes into a sales pitch and you realize it's some kind of recording that will respond to certain answers.  If you want to have fun with it, start talking nonsense and it throws the recording off and it will disconnect.  If you REALLY want to have fun with it, play along and you will eventually get to a real person.  If it's the female, ask her if she is a spitter or a swallower.  If the male answers, keep asking him, "Is it true?" over and over. Eventually he will say, "Yes it's true."  Then say, "So it's true, your mother performs oral sex for free."  "Wow, you must be proud."  After they call you a few expletives, they'll hang up.  Hopefully this will cause them to remove your number from their phone list.  So far, I've found this to be the best effective way to avoid repeat calls.