Let me tell you about Spammer McAsshole. Mr. McAsshole is a guy in my contact list. I have never met señor Spammer. I don't know what this McAsshole looks like or what kind of car he drives. All I know is that he calls my phones from different numbers every day. McAsshole sends me e-mails from different addresses. Sometimes they repeat, sometimes they don't. S. McAsshole likes to warn me about my fictional warranty expiring on my car.
When they do repeat, my spam filter doesn't catch them or the Do Not Call list I signed up for years ago didn't do its job, then I add his information to this contact. That way, I recognize Spammer McAsshole for who he is and disconnect the call before I pick up to answer to an answering machine.
These machines Spammer McAsshole uses detect how long it takes you to answer, any background noise or if it is a data line or fax machine #. If you pick up, chances are you will get more calls from Captain McAsshole because he will know you are a live person on the end of that line. If you disconnect, I would imagine Spammy doesn't get any usable data.
Whether I change anything or not, its really gratifying when I see that name ringing on my phone. That gives me permission to file a complaint with the Do Not Call registry. If you get a call like this, file a complaint here. Do some good and don't be a McAsshole!
Here are two numbers I frequently get called from.