This is a Canada Revenue SCAM....just hang up. The automated voice is definitely NOT CRA...plus Revenue Agency never call people, they send letters...IT'S A SCAM
CRA scam. Ignore the fake threat but report it to their service provider. The number is owned by Fibernetics....report it here:
http://www.fibernetics.ca/legal/nuisance-calls/ they will block the number if they get enough pressure