The body of the complaint should clearly and concisely state the reason you are bringing suit. Include the dates on which transactions occurred. 3.Find information and tools to submit a consumer complaint to the Consumer Financial Protection Bureau. Complaint Information. Please explain your complaint: Try to be brief, but be sure to tell WHAT happened, WHEN it happened and WHERE it happened. The first step in filing a lawsuit is to prepare a complaint. The Court has specialized forms available for filing complaints for employment discrimination. Learn where to file a complaint about banking and investment products, retirement plans, and the companies and professionals that offer them. Learn More About the Complaints, Grievances, and Fair Hearings Processes. The more information you provide, the better we can help you.