Complaint sample. PDF. Complaint fill in. PDF.The process of investigation is. Address customer complaints professionally with our acknowledgment of customer complaint letter template. Create and download a letter for free! The DELE has an online and fillable pdf Complaint Form available to use to ensure all of the necessary information is captured in the complaint. Sample Letter to Parents. Fill out the online Nursing Home Complaint Form located below. This sample letter has choices to help you build your letter. When you write, pick the words that describe your situation.