Same deal. Claiming to be from cra. I did call back out of curiosity and "officer " Thomas Scott  (who has a thick Indian accent so not likely his real name) informed me that cra did an audit on my 2010-2014 taxes and they believe I willingly claimed things and purposefully defrauded them via taxes. So. I called the company that does my taxes. They said they've received lots of calls like mine and it is indeed a scam.  Not sure how this scam is supposed to play out since the conversation ended with him saying... "ok, I guess you can just wait for the police to show up at your door."  I meant to ask for his badge number but forgot.  Ok tough guy. I'm soooo scared.