They got 'em! Police in India arrested more than 70 people and more than 600 are being questioned and facing arrest. Here is just one report: http://abc27.com/2016/10/06/dozens-arrested-at-india-call-center-linked-to-irs-scam-calls/
Just today a client called and said the IRS has been calling her (she does have IRS issues), but she could hardly understand their thick accents in the message and every time she called back no one picked up. Hopefully that indicates the authorities have shut off their phones and with everyone in jail there is no way they can answer anyhow. I told her to read today's paper.
Of course, I'm sure there are many more scams like this one still operating. And like with local drug gangs, when one gets taken out of commission others pop up to fill the void. Well, at least we and our clients will have a reprieve.