Same situation as you all have explained. Foreign sounding gentleman kept urging me to access something on my computer mentioning security threats and viruses to scare me. Spoke very quickly and asked me to type something in my web browser. He hung up as soon as I requested more information. He was using information from a legit network security company, so I immediately contacted the company and they let me know this was a complete scam.
Called me on my cell. Hello I'm ....from IT service. We are trying to do updates to your computer. He knew my last name. I hung. I told him I did not want his service. He started yelling. I hung up.