Thank you for your letter of November 26 while fully engaged . We apologize for being late with the payment. I’m sorry because the invoice was misplaced.
We be payment be made today 這一句怪怪的, and to add 5% damages. Again we are sorry
for this error. I guarantee that don’t 是不是該改成 won't make the same error next time.
If your company had new software, you would 這裡因為是己方有疏失所以建議改用較謙卑的姿態---could you fist notify us, please.
We look forward to working with you in future
Sincerely,

還有啊,裡面第二個"error"改用"mistake"不曉得會不會比較好!?偶有標起來~