Answer the phone when they call and conference in the Jolly Roger telephone bot http://www.jollyrogertelco.com The bot will waste the telemarketers time, which is the most expensive thing that these companies are paying for. Do this enough times and the calls drop off rapidly.
I'm assuming the companies running these illegal calling scam operations, don't share a DO NOT CALL list.
I could see this working against each company individually. So if its only one bad actor that has your phone number, that would work.