As it was posted earlier, the card service scammers are mainly drug addicts, felons, or both, who prey mostly on the elderly. We cannot expect much of these types of lowlifes, but as bothersome as they are, the decent people of society can be thankful we don't have to live the miserable lives they themselves caused. Hopefully, as they get older,(which most of the addicts seldom do) these disgusting creatures will also be cheated by a younger group of scammers to the point where they must live on the streets or in the woods.
The DNC list does no good for these people since they are not telemarketers. They are scam artists. They call using number scramblers, so when you try to call back, you get a message that the number is disconnected. EVERY TIME you talk to a live person, if you don't fall for their BS, they will hang up on you...if they don't verbally abuse you first. I am unemployed, so I answer every call, as it may be a potential job. When I get a live person, I simply say "get a real job, loser" and hang up. No point stressing over these calls since there is nothing we can do to stop them.