“If the guy has an India-sounding accent and says his name is “Steve”, “Bob” or the like, it’s almost certainly a scam!”
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Sometimes it’s a gal.
https://www.youtube.com/watch?v=KVEiQnMnACc
Also, this advice:
“Just Hang Up: Why You Shouldn’t Taunt Fake Tech Support Scammers”
http://www.makeuseof.com/tag/just-hang-shouldnt-taunt-fake-tech-support-scammers