Sample email to decline order

Reference to your fax letter dated November 01, 2000  regarding the acceptance of order for XYZ products, we would like to draw your kind attention on following points.

-                        We regret to inform you that we are unable to accept the order for the above said  item only, because all the expenses as ( freight, custom charges, insurance etc.) have been calculated based on the total value of the quotation.

-           Our best delivery time would be 12 weeks.

Thank you for your understanding and cooperation.