Two things come to mind.. First, review the following thread on the "7 Biggest lies Exposed (Bill Collectors)" at:
http://www.articlesbase.com/debt-consolidation-articles/bill-collectors-the-7-biggest-lies-exposed-554932.html
Second, should this firm opt to initiate legal action, to comply with the Ontario Courts of Justice Act both parties will first partake in mandatory mediation process. See link below for additional information on the subject. That said, if you were ever to make it to the mediation process, you'll have an opportunity to present your offer, as well as a payment strategy to address the balance.
http://www.e-laws.gov.on.ca/html/regs/english/elaws_regs_900194_e.htm#sched24.1.01
RULE 24.1 MANDATORY MEDIATION
PURPOSE
24.1.01 This Rule provides for mandatory mediation in case managed actions, in order to reduce cost and delay in litigation and facilitate the early and fair resolution of disputes. O. Reg. 453/98, s. 1; O. Reg. 198/05, s. 2.
Note: On January 1, 2010, rule 24.1.01 is amended by striking out “in case managed actions” and substituting “in specified actions”. See: O. Reg. 438/08, ss. 15, 68 (1).
NATURE OF MEDIATION
24.1.02 In mediation, a neutral third party facilitates communication among the parties to a dispute, to assist them in reaching a mutually acceptable resolution. O. Reg. 453/98, s. 1.