How can I get rid of the constant scam calls claiming to be Microsoft?

Episode 905 (1:43:05)

Ray from Riverside, CA

Ray got a call this week from someone claiming to be from Microsoft telling him he had a virus on his computer. Knowing he was full of it, Ray hung up. Leo says he's right to do so. The scammer keeps calling though. Leo says that's because he's from a sweatshop in India making calls over and over. They try to remotely take over the computer in order to infect it with viruses. It's the latest social engineering scam. Microsoft will never call you. And what makes it so convincing, is that the calls are coming from tech support people moonlighting on their free time.