Steps of writing a complaint letter:
1- Be clear and brief
2- Say exactly what you want done
3- Don’t write an angry, sarcastic, or threatening letter
4- Include all the documents and paper
5- Include your name and contact information
6- Include copies of relevant documents

samples of written complaints
1- poor service

Customer Service Manager,
I am writing today to complain of the poor service I received from your company. I have been with you since the company was founded and have never encountered such treatment before. A few weeks ago I ordered a vase through your mail order catalog, but when it arrived it was shattered into several small pieces. The invoice is still valid. I look forward to hearing from you through my email.

Thank you
yours,
Gerard Hobbes

2- complaint of objection

Dear club members,
I am concerned about the way some of our book club members use the club as a forum for their political views. Our initial purpose in organizing the club was to meet monthly to encourage the reading and discussing of good literature. We have followed that philosophy for many years, but it seems the newer members want to spend most of the time on political issues. I am waiting for your email response as soon as possible.
thank you
yours John Edward