The best I ever managed with the MS support scammers was to tell them that my IP address was 127.0.0.1
These days, all I have to do is politely ask them for the IP address of the machine that's sending the reports they claim to have received, and they hang up on me.
I still get possibly non-scam calls asking for people who haven't lived at this address for fifteen years.
Actually, they haven't lived anywhere, period.
