A letter of complaint regarding an error in an invoice for Services. It also states the action being taken in reconciling the difference and requests an amendment to the invoice.
We have received your invoice on the [Services] rendered as of [date]. We were surprised to find that the invoice rate does not correspond to the price quoted on the quotation dated [date].
According to our agreement, your charge / rate / commission should be [amount / %] per [hour / order]. [You will also give us a discount of [amount / %] per [hour / order].] However, the invoice we received showed that you are charging [amount / %] per [hour / order] instead, and the total amount due as [invoice amount] – a difference of [difference].