"Wouldn't they have access to all that info already since the creditor is the City of Toronto? "
Maybe not. Revenue Canada, now that's a government creditor that you don't want to mess with. The city will use regular collection agencies, maybe they send it to a law firm to try and recover.
But yeah, Ray's right. Don't volunteer information.I'd even go as far as to open a new bank account with another bank or credit union just in case.