business letter

大至上無錯處, 只有少少字眼上更改及串錯, 更正 in red, 希望可接受.
We regret to learn from your letter of 9 April 19XX that the textiles in Bale 3 have found damage and material in Bale 2 are not as the samples.

According to our result of investigation, we packed the ordered goods with care and with witnesses observing the packing process to assure the standards. Furthermore, the shipping company informed us that the delivery was completed and in good condition during unloading. Consequently, it seems unlikely that the problems are stemming from the packing, and the damage may occur during inland transportation.

As far as we are aware, the revised contract, made with Ms John Chan, shows that you order the economical material as an alternative, so they are not exactly like the samples of CX106.

We appreciate your patronage of our products and have good business relationship between us.

However, we regret that we can not (accept) fulfil your request. You have been inconvenienced by this unfortunate situation, we would suggest that you make your claim at the inland forwarding agent. Upon request, we can ship the textiles for 750 meters of CX106 with priority and provide the shipment with payment term of within 60days.

We further hope that the unfortunate situation had no marred your impression of our company, and we do appreciate you giving us the opportunity to serve you.

are you trying to use "furthermore" instead of "futthemore"?
and "we packed the order care"?
you should use "delivery was completeD", and "the shipping company informED"
i think there is something wrong with the third paragraph, it sounds.... rude, and there are mistakes with the grammers too.
and the last paragraph should be "you" instead of "your giving..."

Hope i helped. =]

very good!it is all correct