1234, Main Street
Boston, MA 02123
<Recipient Address Goes Here>
<time of order>, I placed an order for <product ordered> with <company name>. At that time, I was assured that my order would be in <time you were told>.
To date, I have received no word or notification that my order has been filled. Please contact me to let me know what is causing the delay and when I should expect my <product ordered>. I will look to hear from you <time you expect to hear>. You can reach me at <phone number>.
Thank you for your time.
encl: <List of enclosed items goes here>