How To Write A Letter Of Dispute To Collection Agency . I am writing this to notify you the disagreement related with the document send by quick solution and collection on 16 february, 2014. The date on which the debt fell into arrears and the date of last payment made, including a copy of the last billing statement from the original creditor. Section 604 Dispute Letter Template from sectionaldesign.netlify.app 2.1 cease and desist letter template. 2.2 debt validation letter template. While it is legitimate for a collection agency to collect the money owed, it is not legitimate for them to intimidate and harass the consumer.