A while back someone posted a Dropbox link to a list of tech support popups. All of them are down already, all except one.
http://chinasi.xyz/3678/c/your-computer-is-locked-call-us-at-tollfreenow--1-844-324-3678-your-computer-is-locked-call-us-at-tollfreenow--1-844-324-3678/
“your computer has been blocked”, 268D3, phone 1-844-324-3678
I've called a few times. Mostly they do normal stuff and get mad, but if you get a guy named Max with a high voice (they say he doesn't work there but maybe he still does) he's pretty nice.
By the way the post I'm referring to is replace/d/463-fake-tech-support-websites