Oh my, you could have some fun with these people.
Give them my number! I have an old, barely working PC somewhere... I could easily get it up and working and put some hardcore porn image as a desktop on there. Then have them connect and confirm they can see it OK... oh the cheap laughs!
BTW, I have a new game I play with cold-call marketers that can easily be adapted to any scammer... see how long you can keep them on hold. My record so far is around 9 and a half minutes.
It went a bit like this...
*ring".. (hmmm i don't recognise that number, who is is?)
Me: "hello"
Them: "we want to sell you crap" (I'm paraphrasing)
Me: "Oh, yeah, funnily enough I'm looking into that, hang on one moment will you".. mute mic/hold/whatever for about 30 seconds
Me: "Sorry, yes" (this is important, you must say yes) "... I'll be with you in one second, I just need to finish this"
Them: "OK"
(wait 30 seconds, no more)
Me: "Right, yes, sorry...." (let them start to speak then interrupt) "hold on, hold on... ahhhhh... sorry, one second please" (here's where it really kicks off.. pretend something has happened but you really need to talk to these people, the event itself need never be explained - e.g. 'oh no, I've... gah!' or 'oops, oh no!')
Me: "Gah, I'm sorry, I'll be right with you" (be nice)
Them: "That's OK"
(wait for a minute or two)
Me: (flustered) "hello, yes, sorry, it's just.. oh! Er, yes, you've caught me at a good and bad time.. (distracted) one second" (back on hold)
(wait 30 seconds)
Me: (flustered and distracted) "Sorry, I've got a problem here, I'll be back with you as soon as (mumble a bit)"
(wait 2-3 minutes)
Me: "Hello?"
Them: "Hello.."
Me: "Oh look, sorry, I'll be right with you..."
(wait 2-3 minutes)
Repeat last 4 stages - increasing time on hold if you wish - until they get fed up and hang up, at which point, obviously, the game is over.
For added giggles, mute microphone and listen in to them chatting to other office staff as to whether they should hang up or not. They are trained not to hang up on any possible lead so use positive words and phrases, especially early on.