If this were happening in the U.S., I would definitely recommend you talk with a consumer law attorney. Under the federal Fair Debt Collection Practices Act, a collector cannot contact a third party about a debt if they know how to locate the debtor.
But I have no idea what laws apply in Canada. The best advice I can give you is to talk with a consumer law attorney in Canada who specializes in this type of law.
Please do let us know what you find out. I'd be interested to learn how your consumer protection laws compare.
