I've had 8 of these calls in the last month (had two in one day a few weeks back).
For me, the most frustrating part of the experience is that regardless of what you say, they follow their script to the letter - they're like method-actors which never get out of character. Just once I wanted them to say "ok - you got me!" but alas - apparently not having a PC or Windows is not enough to sway them.
If they're so true to their scripts it should be easy enough for someone to listen to a call and formulate a response that can just be played down the phone, requires no time investment from the recipient of the call and because the scammer is so desperate for a sale they'll stick through even when it seems like the person on the other end isn't 100% legit.
For me, the most frustrating part of the experience is that regardless of what you say, they follow their script to the letter - they're like method-actors which never get out of character. Just once I wanted them to say "ok - you got me!" but alas - apparently not having a PC or Windows is not enough to sway them.