[DATE, ex. Monday, March 31, 2008]

[NAME, COMPANY AND ADDRESS, ex.
Link Building
XYZ Inc.
1234 First Street
Suite 567
Anycity, Anystate  85245]

Dear [NAME, ex. Link Building],

I am in receipt of your invoice #[INVOICE NUMBER], dated [DATE, ex. June 8, 1998].

[STATE WHAT YOU HAVE AND HAVE NOT RECEIVED, ex. Although the shipment of 20 compressors has arrived, we have not yet received the 2 1/2" piping required to install them.]  I will be pleased to send you a check in the amount of $[AMOUNT] once we receive the above item{s} and the order is complete.

Sincerely,

[YOUR NAME, ex. Jill Jones]