Microsoft will never call you about a virus, lottery, or your upgrade options.
They have said as much.Right Here.
They do not have the time or staff to do so. I say this as a public service to you the reader. Trust me, I see what happens several times a week, when customers bring in machines that have been compromised when they allow some person from a 1-8XX number remote access to their computer. It’s not going to end well for you or your personal info. You have been warned.