商务英语写作范文:因数量不一致，补运替代品

Dear sirs:

　　On investigating the matter of your claim,we have noticed a discrepancy ?between? our invoice figure and the quantities you specified.

　　On the quantities you required,we will ship the replacements at once.

　　We sincerely apologize for the inconvenience you have been put to.?　　

　　Yours,