请英语高手翻译一下，谢谢，

Dear

We are sorry to inform that we can’t supply 3 cartons of product for free which we have agreed before. Due to lake of experience on international trading, we didn’t realize that there are so many procedures involved. So we will delivery the bulk quantity as pre our original schedule. Sorry for the inconvenience caused to you.

Regarding the balances, we will turn to bank for further detail information as the total amount we received was $1321.5US.

We can’t delivery the goods to you this Friday until next week, as we as we get information from shipping company that all bulk freighters are full now, please note, thanks!

Best regards!

您好，
原来免费赠送给您们的3箱产品，还要添加很多手续，我们是第一次做出口生意，所以不了解，真抱歉。所以，我们决定还是按照原来的数量给您们发货。
关于预付款的差额，我们决定去银行打听一下，因为我们收到确实只有1321.5美金。
货在这个星期五肯定发不出去了，真抱歉，因为散货船的仓位已经没有了，只能等到下个星期了。
祝您过的愉快。谢谢！

Hello
Free gift to you at the original 3-box products, but also to add many of the