We've been getting those calls here in Australia for several years now.
Except, these ones seem to know your surname and realise that they are from Microsoft, not "Windows." (Lol).
Still, they haven't rung since mid last year after several days of them ringing. I decided I would pull a dirty trick and try and send a loud tone down their line, courtesy of Audacity.
To be honest, I THINK the microphone on the handset actually entered some sort of proaction loop, since I kept hearing the person calling out the surname, "Are you there Mr. X? Hello?" So I couldn't send my 10K Hz tone down the line to them... Such a shame.
I couldn't believe when they hung up, redialled us and entered the same old thing again! IDIOTS!
Following that, I scripted my response to their questions in Text-Edit on my Macbook. I was planning on using Alex (The built in voice) to narrate it for me, and make all the funny sounds I added in there of me plugging the computer together and the computer "booting up" (and subsequently crashing).