+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
I had the same exact problem, but they were fine with the letter my wife sent them stating that I'm not a Canadian citizen and that I'm not working in Canada, or in the US so I have no income. They literally are idiots.
 
CRA has the collective IQ of a small eggplant. Dealing with them is about as much fun as chewing on tin foil while shaving with a cheese grater!
 
Man, I hope my husband is here, landed with a SIN number before the next set of taxes are due... I sure don't want to deal with all that!