We have received several calls from numbers such as this - and after saying "Hello" two or three times and being ready to hang up, the caller says "Good-Bye". Same canned (I presume) voice. I've reported them to the FTC - would love to have time to keep calling them back - and hanging up. I thought perhaps they were calling to see if anyone was home, before trying to break in.
They called me to fix problems on my laptop (which I have been having). They used Microsoft's name and knew what kind of laptop I had. He walked me through the steps of seeing how many errors are on my computer. He then tried to get me to buy a $99 protection plan, which I refused and hung up. He then had control of my laptop and I cannot use it now. I NEVER trust people on the phone but it sounded like a real phone call.