If they say they're from Rogers or Bell or Microsoft, I say Me too! I'm in the Cyber Fraud department. What's your ADID so I can look you up in the system
If they don't hang up right away (usually they do), or if it's one of the other scams, I just as if their mother knows they're a criminal. I have learned a few very special words in Urdu and Hindi because of that...
Also try: I'm with the RCMP cyber fraud division. We're recording your voice so our AI system can track you if you ever cross an international border. We _will_ find you if you ever try to leave India.