Thanks for writing back to us. I would like to share my sincere apologies for the delayed response from our end.Find out what goes into writing effective, heartfelt customer apology emails with these best practices and free templates. Here's an example letter of how to write an apology letter for late payment. Don't know how to write an apology letter to customer? I Jerald R Clark, am writing to you to apologize for my poor behavior and misconduct. In this article, we'll cover everything you need to know about writing apology letters and provide 5 templates you can use to get started today. Write this brief letter as soon as possible after the incident. Focus on actions taken to rectify the situation rather than on any damage that resulted. Begin your apology letter with a sincere statement apologizing for your action or mistake.