The Illinois Department of Revenue (IDOR) sends letters and notices to request additional information and support for information you report on your tax return. Instructions for completing the UI-28 are on Page 2.The UI-28 Form is on Pages 3 and 4. In this article, we'll show you how to write a refund request letter template that not only grabs attention but also persuades companies to act in your favor. Draft your letter on both e mail and your word processing program. A program to help you complete the forms to start a case in the Northern District of Illinois federal court. "Generate a tailored demand letter to retrieve your personal property. Some refunds are processed automatically. Property is returned at no cost with the proper identification. Compare the information in the notice or letter with your return.