If you really want to hurt these guys, do what they fear the most - waste their time.
Use fake information from FakeNameGenerator.com and you can keep them on the line for ten, twenty, even thirty minutes and longer. You have fun and you keep some poor sucker safe because these scammers can't call other victims if they're wasting their time talking to you.
The card service scammers WILL 'service' our credit cards, BUT, when they finish 'servicing' them, they will have NO available credit remaining! People that are fooled into having their cards 'serviced' will be charged a MINIMUM of $795.00, and many times the ENTIRE amount remaining on the card. The card service scammers are a disgusting group of degenerates, who prey mainly on the low income, and the elderly, but will cheat anyone that they can!
The more I've reported unscrupulous calls to donotcall.gov, the more calls I've gotten....(such as this number) which voilate donotcall.gov.... Makes me wonder who is, indeed, selling my number.....