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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. What is the Format of Complaint Letter ? The letter of complaint format is a formal letter written to the concerned authority if you have any problems/ dispute/mistakes/misbehavior or any kind of complaint. The format to write the letter is given below: 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 . A letter of complaint is a formal letter generally written to the concerned person or authority to address any wrongdoing, malfunction, or injustice over a product or service.