We've got you covered with 25 customer apology letter templates so you can swiftly say "I'm sorry" and start delivering a solution. I ordered something from the official store on the 8th and received a confirmation email with my order number, and my card was charged.I've been a consultant for many years and quite often I am working according to deadlines. Get 4 email templates you can send out to customers when their order is delayed due to production issues. How to apologize to a customer. Here's an example letter of how to write an apology letter for late payment. Template names: BACKORDR.