Re: "four to six million recorded telephone calls a day"???
" Did nobody from their phone operating compay *notice* this?"
As long as they were getting paid for each call why should they care? It's hardly in their favour to stop a cash cow as they were probably profiting from this almost as much as the charming people making the calls.
The solution is clear, make the telcos financially responsible for sustained detectable abuse of their systems. They can easily detect this sort of behaviour if it's maintained for more than a few days from a single location and on detection they should either pull the plug or involve the authorities in prosecuting the people involved.