Have had three calls from this number today. No one speaks when I answer then I get an automated female voice saying "goodbye".

CALLER SAID SOMETHING TO THE EFFECT (WITH A HEAVY ACCENT) THAT HE WORKED FOR MICROSOFT AND THAT EVERY TIME THAT I CHECKED EMAIL ETC (AT THAT POINT I INTRUPTED)
I SAID "WHAT DO YOU WANT"?  HE STARTED AGAIN WITH SOMETHING THAT SOUNDED LIKE HE
WAS READING IT........SO I HUNG UP.
.

Received call on my cell phone-Quebec,Canada showed up-heard blip of a female voice and then was disconnected.
Tried to call back and got message "your call cannot be completed"
I have this number and my home number on the "Do not Call" registry-far all the good it does,

I got two calls from this number today.  When I tried to add it to my blocked-number list, I was told the number couldn't be added because it was "invalid."  Maybe because it's in Canada?  Anyhow, I was looking forward to not getting any more calls from these creeps, but I guess that's not going to happen.

These callers are calling from multiple numbers saying my computer is spreading viruses and needs a virus scanner software
that I'm sure they will gladly sell you.
If you want to mess with them and have a laugh ask them what IP address my computer was spreading the virus from? We all have an IP address provided by our internet company, but they don't understand the question and will pause and just hang up.