Simply replace the unfilled areas such as "[]" and "[date]" with your information.
Dear [name],
It was distressing to learn that the [product] we shipped to your firm last week arrived in bits and pieces. Per your request, a new shipment for [amount] left our dock this morning and is scheduled for delivery to you on [date].
I am sorry that this occurred and sincerely appreciate your continued patronage.
Best,
[name]