What you should have done is take the opportunity to see how long you can waste the scammer's time for, by acting dumb and generally keeping him talking. I had one going for 15 minutes once. I believe others on here have done even better. I had him giving me instructions for finding my way to the relevant menu and options to allow him access, without ever telling him I have a Mac. It was ages before we established that the reason I couldn't see the Start button, was because I don't have one.