You have to get this all in writing. A collection agency will work you every which way from Sunday to get you to pony up, whether you owe the debt or not. You have a right to challenge the so-called debt, and can launch a dispute with the credit bureau if it shows up on your account and you believe the information to be false. As for the collection agency, they have to be able to provide proof. Do yourself two favours: One, communicate only in writing. Collection agents are trained to get you riled up. When you're emotionally involved in a telephone conversation, you can't make good judgements, and they count on this. Some people cave under the pressure and starts making payments, whether they need to or not (referring to the Statute of Limitations and debt that may/may not actually exist). I don't know about your province of residence, but in BC, if you send a written request to communicate only in writing, the collection agency has to oblige. Each province has an Act by which collection agents and agencies are bound. This includes code of conduct. Look for it online and read up.
Two, read up. Knowledge is power.



