The process of investigation is. Address customer complaints professionally with our acknowledgment of customer complaint letter template.Create and download a letter for free! This sample letter has choices to help you build your letter. When you write, pick the words that describe your situation. Fill out city of chicago department of buildings aldermanic acknowledgment letter online. This page includes all DCFS forms available online. Forms are available for view in either or both of the following formats. A 14-day letter is simply the first step in the ARDC's process and receiving one rarely results in a formal complaint. Most are dismissed upfront.