I just got called by someone from "Global Security Services." He had a very pleasant South Asian accent. He started with "I assume you are running the Microsoft Windows operating system." To which I answered "Of course not!" He quickly hung up.
Now, I'm going to be highly suspicious of anyone calling me long distance without caller ID info. The "Global Security mutter mutter" made me highly suspicious that this was part of a new phishing scam that's been going on. The goal is to have you install some "Microsoft Security product" which is of course malware.
Notice to readers and family members: They are calling people in Canada. Never ever install anything a cold-caller says to. Ideally stop using Windows at all. It's security is atrocious and the knowledge required to keep it secured is beyond most normal users.