Hey Crazy,
If this debt is past the Statute of Limitations (SOL) which is 6 years in BC there is not much they can do to collect this debt from you.
"British Columbia - Section 3 (5) of the BC Limitation Act sets 6 years as the limit for debt"
The SOL starts from the last time your wife acknowledged the debt. This means either she said she will pay the debt on a call to a collection agency or made a payment. Making a payment on the debt is considered acknowledging the debt.
So, if in the last 6 years your wife did not make any payments or acknowledged the debt in any way (verbal or written) then you guys are in the clear.
The collection agencies from the collection agencies will continue to call until you take some action. They know that most people don't know the laws and will give into intimidation.
Ray will be able to tell you more about what you can do to stop the calls. Not everyone here likes Ray's ways of dealing with the collection agencies but I certainly do :-)
I believe if you can mail them a registered letter stating that you dispute the debt, and you want the them to take you to court. The other thing you can do is have them communicate with you in writing only.
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British Columbia Business Practices and Consumer Protection Act, S.B.C. 2004, c. 2, ss. 116(4)(a)
British Columbia Business Practices and Consumer Protection Act, S.B.C. 2004, c. 2, ss. 116(4)(c)
http://www.qp.gov.bc.ca/statreg/stat/B/04002_07.htm#section116
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Just make sure you do not acknowledge the debt in anyway now!