Business reply letters are a tool that makes reference to a meeting or correspondence that was received. Be sure to include a thank you in the opening, and a reference to what the issue is. Be mindful of who the audience is, company jargon isn't appropriate to include to a customer. Be polite, and respectful, and address the issue at hand. Close the letter with a phrase that keeps the
. communication lines open. You can get more ideas at http://www.ehow.com/how_4689681_write-business-reply-letter.html.