I have gotten similar call and same call from officer John. Call back number likely has charge associated with calling. If you reverse 411 the call back number it states clothing distributor in Toronto. I hope to answer next time and will give them the what for :-))
This is officer John Parker from the CRA. Said "You or your attorney" (had no apparent knowledge of my name and I'm PRETTY SURE THE CRA knows what I like to eat for breakfast :) ) must contact me at 647-873-1146 immediately once you receive this message. Don't try to disregard this message. If you do, I wish you "good luck" as the legal situation unfolds upon you.
I've got the same call. He left a message on the answering machine. He only speaks in English. My message is only in French!!! What a stupid guy! CRA don't call you. They contact you ONLY by mail. Don't call back