帮忙英语翻译翻译

Question

非常抱歉，这个是我们的疏忽。
因为（发票号码：123）已经报关，没有办法修改发票，我们会在（定单号码：456）减少3300 美金。
我很抱歉给您带来的不便

Answer 1

I am deeply sorry for our negligence.
Right now we are unable to alter the invoice (Serial No.123) because it has been declared at the customs. Therefore we will reduce $3,300 from the order numbered 456.
Apologies again for the inconvenience caused to you.

Answer 2

My apologies, this was our fault（this was due to our carelessness).
Because that( Receipt number : 123) has already been sent to the custom, we don't have a way to change to receipt. We will reduce $3300 from (Order number:456)
I'm very sorry for the inconvenience this brought you.

3300美金！