Do you have a CRA online account?? If yes, any issue they will direct it to that account ALWAYS. They will never call. If not, I'm pretty sure you get a letter. I have also got scammed from someone wanting banking information. I called them back and asked who they were looking for... Then the person asked what my name was!!! I'm like shouldn't you know that, you called me!!! I like having that account because I know anything there isn't a scam. I pretty much never trust when someone calls me (except Amazon... They are the only place that legit calls me to pick up packages... Joys of no buzzer).