Well this has happened to me twice in the past 6 months. Of course I'm not that stupid as I know full well my computer doesn't call anyone and since I haven't had it on line in over a month I'm more then sure it didn't.
So I decided to go look into this a bit further to see what scams are going on and it brought me to this website that explains how this type of scam works.
http://blog.malwarebytes.org/fraud-s...-and-trash-pc/
I have looked at several website that talk about this but this one has the best explanation I've seen and since the person recorded most of the scam you can hear it as well.
SO be informed, and don't let someone take you for a ride on this.