How To Write A Letter Of Wrong Delivery . The kolbn company would like to thank you for trusting in its products. Ensure to include in your letter the exact documents you are attaching. 9+ Apology Letters for Mistake PDF, Word Sample Templates from www.sampletemplates.com Here under i am giving you a sample complaint letter about wrong product shipped. Express your confidence that the problem can be resolved. Unfortunately, after the products were delivered and when i opened the delivery package for checking the products inside.