样品太长时间没有寄给客人了,怎么样写英文邮件给他道歉

样品太长时间没有寄给客人了,怎么样写英文邮件给他道歉
几个样品太长时间没有寄给客人了.客人发火了.请看以下客人发给我的邮件.
I am getting very concerned about the time taken for you to send us samples,and not just on this order.
Frank and I discussed the khaki with you five weeks ago whilst we were in your office.
Our customer is here this afternoon,Truworth’s,and it puts us in a very difficult situation having to explain that five weeks later we still do not have a sample.
Especially as this is a repeat order and all that is changed is the colour.
Truworth’s lose confidence in us and will place orders elsewhere.
I am not feeling confident going forward that you can deliver if we cannot get samples from you.
From date of spec to delivery in South Africa we expect a 3 week turn around time on samples,this is what all our competitors do and we need to do the same please.
If there is a problem then please let us know so that we can inform our customers.
We have placed a great deal of business with you in good faith and I do not feel confident going forward that you have systems in place to ensure swift making of samples and good record keeping of what has been sent to us in terms of fabrics and coloration.
We should not have to chase you for the samples.
请大家帮帮忙教教我怎么写封道歉信给客人.我从来没有写过英文道歉书.

看了客户的信感到和他们一样发火的感觉, 你们也太过份了啊, 如果帮你写了道歉信而你们不改,那还不是帮你到忙啊. 但又想,都是中国人帮中国人,提高中国人的信誉吧.我写的信十分诚恳,客人看了定会感动和原谅,但如果你们不改,客户是不会再相信你们啦. 最重要的一点还不是不及时发货,而是不及时和对方沟通. 今后如果不能保证很快发,但必须及告诉对方. 回信快在生意中是最最重要的.
Dear xxx,
First, I have to apologize deeply for the delaying of sending you the samples and for all the difficulties this has brought to you, and the loss of potential business that you have. Although I might have pages of excuses, none of those could satisfy us and made us forgive ourselves. We could have, and should have at least let you know in advance.
I now guarantee that this would not happen again. Our success depend on your success, and that working together with you, we have confidence that we will do as good as, if not better than, our common competitors.
Thank you again for your frank criticize and open communication with us, which is the very basis of all successful co-operations. We will make all the efforts to improve our service in terms of efficiency and quality, and your comments and suggestions is always appreciated.
Sincerely,
xxx