Yes, they only have to score once to make it worth their while. The Microsoft one responds very well to the following bait:
MS: I've called to help you with a problem on your computer. etc etc.
Me: Oh thanks, it has been very slow to start up this week, maybe it has a virus. Please wait while I go downstairs, I'm old and cannot move quickly. (mute phone for five minutes, put kettle on)
MS: Hello hello?
Me: Thanks for waiting, what should I do now?
MS: Click on this etc etc, and do etc etc. What do you see on the screen?
Me: Can't see anything yet. (Continue charade and realise you haven't turned it on. Wait another five minutes for slow loading etc) Make cup of coffee.
MS: Hello hello?? Are you there?
Me: sorry to keep you waiting, I've turned it on and the screen is on too. Do you want me to open Windows?
MS: Yes, then go to system (or whatever scam he has in his script)
Don't answer him, make hemming and mumbling noises, drink coffee, say I don't understand ..
Me: Thanks for waiting, it's very good of you, now I've opened the windows, do you want me to open all the doors and let the virus out?
MS: $****$*****$$ ! Click...