Dear :

After examining the [goods] supplied to our order #, we were very disappointed at their shoddy workmanship. They certainly do not match the samples you sent us and are unsuited to the needs of our customers. We have no choice but to return them to you and require a replacement. If this is not possible, we have to cancel our order and ask for a refund.

If you can replace the [goods], we are prepared to extend the delivery date to [date]. We hope to have your reply no later than [date].

Sincerely yours,

[name]

[title]