I think what they are saying is they do not investigate individual complaints, they file them and once there's enough complaints to establish a trend then they act. The do not call list does not work.
What is needed is a global spam list, much the same way email works. But telephone companies make money off these scammers, and so that's not likely to happen at the provider level. Thus what is needed is a way for consumers to establish a spam list, and a way(maybe an app) for cell phones to check that list when a call comes through. Once 10-20 people put you on the list you're done, all calls get blocked. For analog lines, a small internet connected device could be developed to sit on the line before the phone and block calls. Same for business PRIs. Want to get off the list? $10,000/line. Problem solved.
I'll get to it shortly
