It's the usual CRA scam that you owe money and, if not paid immediately, the cops will show up at your door to arrest you. I have a Panasonic phone that allows me to block numbers while the phone is still ringing, so that's exactly what I did because it's a Montreal area code. They've called 4 times since.
Robo call threatening lawsuit and arrest from "Canada Revenue". They have called 6 times in the last 4 days. What a scam. If anyone knows of a way to report them to Bell Canada, post it please!