ML,
I can see that you were addressing Saskatchewan in your response to this question - and I have not reviewed that provinces collection laws.
Just wanted to point out for others that according to Consumer Protection, this is not the case in Ontario.
Per: http://www.gov.on.ca/mgs/en/ConsProt/STEL02_045978.html
The regulations forbid collection agencies from:
Contacting you until six days have passed from sending you written notice of the following:
• the name of the creditor
• the balance owing
• the name of the agency and its authority to demand payment
That link also outlines other prohibited collection practices, too.