Couple of questions: First, approximately much do you owe on the account? Second, when was the last payment made on the account?
Just so you are aware, the threats that this agent was spewing are quite common in the industry. Although typically illegal, they are still used regardless because the average debtor is not well versed on the laws governing these agencies. Review sections 20-25, Prohibited collection practices, under the Collection Agencies Act for Ontario here for additional info: http://www.e-laws.gov.on.ca/html/regs/english/elaws_regs_900074_e.htm#BK6
Now, the fact that you've indicated you are willing to pay the debt goes a long way towards keeping you out of any courtroom. From what I've read to date, if the [typical] creditor is aware that you are willing to make payments on the account, though it may take some time for them to collect the full balance, then it's probably within their best interest to take the offer as oppose to initiate legal action. Reason: Why spend more $$ in a lawsuit only to fight a battle one may not win, and also incur legal fees on top of that? In addition, in Ontario there's a mandatory mediation session that takes place before you even see the courtroom - so an opportunity is available to present your offer and have it discussed in front of a 3rd party mediator. Review: Section 24.1 of the Courts of Justice Act here: http://www.e-laws.gov.on.ca/html/regs/english/elaws_regs_900194_e.htm#sched24.1.01

