The phone number and web address keep getting taken down and new ones keep popping up. But there is a Microsoft support scam going on requesting personal information. Do Not give them any information. Here are a couple screen shots from a few different people encountering this scam. Vigilante hackers have done some research and identified a group based in India that also operates a business called iyogi, believed to be responsible for these attacks.
Microsoft support scam takeaway
Always be cautious and pay attention to the details such as sender info and never ever enter credentials if there is a shadow of a doubt about its legitimacy.