In fact,we delivered samples by Express.In order to clear customs smoothly,they change our invoice into a fake one.We didn't know what happened until we see your email.We've talked about this problem with the Express company,and it's agreed that there will be 2 invoices in the future,including our own invoice and analysis report inside,and Express company's invoice outside.Is that ok to you?
Sorry for all the troubles caused by us.
不过这不很正常么?客户就这样生气了?