How To Write A Letter For Debt Collection Lawsuit Nys . New york city regulations require all debt collectors to send specific written documentation verifying the debt. Oval, suite 101, plattsburgh, new york 12903 phone: Debt Collector Sample Response Notice to Dunning Letter (1!5!14 from es.scribd.com Some tips for doing so include: New york city residents can use this letter to dispute a debt, to verify a debt under nyc law, and to tell a collector to stop contacting them. Start the body of the letter with an explanation of why you’re writing the letter.