I got a similar call this morning! Number from Athens, Ontario! Called back, he started scaring me saying that I had a warrant out against me and RCMP is coming after me for tax evasion!
They sounded like a call center with a bunch of desis( Pakistanis, Indians) I realized immediately from his tone that CRA would never be this disrespectful and that this was a scam!
I, being a desi myself, abused his mum, dad and ancestors to which the sob responded with a curse in my language! That confirmed my suspicion and I just hung up!
Just hang up! Albeit I went the extra yard !
CRA need to roast their behinds !!