I'm getting more of these again now, since they've learned to spoof the CLI data. My "International ban" doesn't stop them.
The Windows Support ones seem to know my name and address and a bit about me, which for a load of spammers in India phoning lots of people in the UK seems like a major effort.
They don't argue for as long as they used to. The most recent one asked me if I noticed that my PC was running slower these days; I said it's running extremely fast; he hung up. His number (displayed as 001002) is now blocked, not that that'll do much good.
I had a call today from the "Senior Citizens' Help Centre" on 002036032149. He asked how I was, to which I asked how I could help. He then asked me about what newspaper I read, what television and radio I like (answer "none" to each of those). I think he wanted to sell me health insurance, but I didn't wait to find out.