关于运费的翻译

大侠们好，昨天客户发了封邮件，实在是无法理解啊，大家帮帮我这个小白吧，谢谢 内容如下 you he now worked with us for some seasons, and i think it more expensive to send??freight collect, than is just to send the parcel, and add the freight cost on the total invoice,??i know that all our suppliers will pay the invoice, and if any problem we will always be responsible, and pay. will you pls. check the freight prices if they are collect, and just send? ?“normal”。 背景说明： 我们是客户国内指定辅料商，价格是不含运费的，所以每次到付 快递给服装商，其中一家抱怨运费贵，要求我们跟客人取运费，但我们希望他们自行跟客户结算运费，所以客户来了这么封邮件。是要求我们垫付么？俺英语不好，先谢谢大家啦