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Learn how to write an effective complaint letter with proper format, useful tips, and sample letters for personal and professional issues. You can address negative or bad experiences to your employer or companies through letters. Download and use these complaint letter templates . Want to lodge a complaint in writing but have no idea how to do that? Well, don’t worry because here in this article, we have 12+ formal complaint letter samples and formats that can help you understand how to write a perfect formal complaint letter . These examples of Complaint Letter can help you understand the format, tone, and language used in such letters . We offer detailed explanations for each sample and highlight the important features that make it effective.