A good start, but needs a lot of work. If it's targeting a Windows Support scam, why not tailor the audio to that? Mention one of various viruses. If the "tech" asks you to do something, say your Windows just bluescreened and have them wait 30 seconds while it reboots, all the while saying "hang on, it's almost there", "this thing's been really slow lately", etc. and then play the Windows startup sound. Pretend to have typed your password incorrectly a few times. Occasionally ignore whatever they say and start telling them you're running this program your nephew told you about.

And so on. If you call them yourself and actually follow their instructions, installing something from some site into an isolated, disposable VM and then running it, you can record what happens and then build that into a better script. Trigger these instructions by asking them what they can do to fix your computer, and time their response. Bonus points if you can detect them saying "http" which kicks off that part of the script.