I haven't read the whole thread, but did read the first few pages.
The first thing that struck me was that the real question is how are the PPCs able to raise 40,000 invoices a day (not my figure, but one of the experts here) that rely on the threat of legal action to extort money from individuals? And then, when it gets to the actual legal part of it, many, if not all, discontinue. I realise I'm preaching to the converted here, but the answer to your question is simply 'publicity'.
There was talk of a website to help channel people down the correct route, and I remember Pepipoo used to have a similar 'calculator' for NIPs etc. Looking at JUST PPCs and their increasingly automated processes, it appears that in order to rebuff them we need an automated process also.
As it happens I've been writing software for over 30 years and could probably get something rudimentary together fairly quickly.
Judging by the speed of responses from SP83 and the OP I'm guessing you have some boiler plated responses prepared, this would be a good starting point.
PM me if your interested/agree that we need something to take up the 'easy win' tickets.
@Southpaw82 : If this is to progress the best place for it would be as part of this site, and for that we'd need the owners permission. It's possible to host it elsewhere, if required, but would be better within this sites' mechanism for maintenance etc.