Are they really represent Microsoft Windows?

The guy (Robert) identified himself as Microsoft Windows representative and tried to get me to open my computer because he knows someone hacked into my computer from South Africa and I need help from Windows.

I just received a call from this number, 321-445-1306, and he called himself Michael. The caller ID on my phone read 45-652-9384 but when I asked for his call back number he gave me 321-445-1306. He read my CLSID number from my computer back to me, told me he was from Windows (not Microsoft until I reminded him Windows was a Microsoft product) and tried to get me to allow him access to my computer. THIS IS A SCAM!!! I contacted Microsoft who told me they never call they email and have you call them if need be.

THIS S A SCAM TO GET ACCESS TO YOUR COMPUTER. THEY WILL EITHER DROP A VIRUS OR A KEYLOGGER INTO YOUR SYSTEM SO THEY CAN PICK UP YOUR LOG-IN PASSWORDS FOR BANKING, CREDIT CARDS, ETC.

The number they give you will be answered by a "supervisor" who is part of the scam.

I got this call from a guy with an Indian accent.  I didn't trust it but the guy gave me his number to "check it out" and then I googled it.  I almost went through with it.