(2)
We regret to inform you that due to a system error the ordered merchandise is not in stock.
We apologize for this inconvenience.
You may leave your order active and we will ship your order as soon as the products become available, or you may cancel the order and receive a full refund.
If you wish to cancel your order or to be updated on the status of your order, please call us....(略)

(意訳・略)
システムエラーのせいで在庫ないよ。ごめんね！