This notifies a company that you are canceling a previous order for goods because your order has been delayed or back-ordered.
1234, Main Street
Boston, MA 02123
06 April, 2005
<Recipient Address Goes Here>
Please take notice that we hereby cancel our <order/contract> <order ID>, for <description of goods>, which we understand to be <back-ordered/delayed>.
Please adjust the balance on our account accordingly.
encl: <List of enclosed items goes here>