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Found Source Of Problem
After some investigation, I believe that we have found the source of the problem that led us to our misunderstanding on the ___________ day of __________ 20 __.
When we received your purchase order for [Describe] we were unable to fill the order for immediate delivery due to __________________.
Our letter informing you of this delay and requesting your instructions was mailed to you on [Date]. We did not receive a reply and proceeded to send a follow-up letter to you on [Date].
We've been able to make delivery to you since [Date] but felt that since you had emphasized "For Immediate Delivery" on your purchase order, we should wait for your authorization before shipping.
I can easily understand why you were so upset with us if no one made you aware of our correspondence.
We have always appreciated having you as a customer and hope that we can continue to provide you with our products in the future.
[Your Phone Number]