This sample letter has choices to help you build your letter. When you write, pick the words that describe your situation.In this post, we discuss the ERISA claim process, appealing your ERISA claim, filing an ERISA complaint, when to hire an attorney, and more. Complaint Information. Please explain your complaint: Try to be brief, but be sure to tell WHAT happened, WHEN it happened and WHERE it happened. You have been sued in court. This sixth edition discusses the wide range of issues that arise in litigation under ERISA. Section I addresses the Supreme Court's decisions defining ERISA's. Consumer Action offers a sample complaint letter and an email complaint template. You can cut and paste these documents below.