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Indian authorities raid fake tech support rings after tipoff from Amazon and Microsoft
(www.theregister.com)
This is a most excellent place for technology news and articles.
Also, India is used heavily for actual tech support and call-centers. Many of these places hide amongst them, sometimes in the same buildings as a legit operation which helps mask them.
I'd imagine that a bunch of the people staffing the scam centers are defectors from a legit one, and take their knowledge - and probably customer lists - with them