A letter of complaint regarding an error in an invoice for products which is different from the amount in the quotation. It also states the action being taken in reconciling the difference and requests an amendment to the invoice.
[The delivery of [Products] arrived on [date].] We were surprised to find that the invoice amount does not correspond to the price quoted on the quotation dated [date]. We ordered [quantity] [Products] and under the quotation, the total amount due should be [quotation amount]. However, the invoice we received showed the amount due as [invoice amount] – a difference of [difference].