Student or Learner
We are disappointed that still not receive your reply until today. If you are not possible / unable amend the LC to us this time. Please help to arrange the transferable LC in future, so that we can use it transfer to the factory, the reason as explained you previously.
We are disappointed to have not received your reply yet.
If you are unable to amend the LC for us this time, could you please help to arrange a transferable LC in future, so that we can use it to transfer to the factory, for reasons as already explained.
(Not too sure of your intent for the underlined wording)
Hope this helps