person said he was from Canada revenue agency and that I was undervervue and to phone (613) 699-2403

I got the same thing. They re route your call,  and the device even says so

very annoying. keeps calling, does not leave message.

I just got a ring from this number, which means this punk is doing random cold calls because, you see, no one actually has my cel#. Nice to see my suspicion is right here!

Also had a call from this number several times. Lived in Hong Kong previously and it was possible to have these calls stopped through an ombudsmen, but it seems we don't have that luxury in Canada. Why is that?

Canada, BC, (250) 714-0921 - still keeps calling on my unlisted prepaid cell phone.Assigning a silent ring to this retard-number was an excellent idea.Keep calling, Stupid. No one will ever hear you.

That's how you know it's a telemarketer. There is a delay on the lines. Due to money woes at one point I had to take a TM job and that would happen all the time. Just block number if you can.