菜鸟寄样遇到难题，求大神相助

[font=楷体_gb2312? ?一个月前我给一家印度公司发了一封发信。我们的产品是化学的医用添加剂。客户说要样品。答应给他免费样品一公斤。他了说是上班件。结果因为是化学品，说要一个安全检测要250.客户和公司都不愿出这个费用。于是客户后来又说把样品加在试管里，就变成成品了估计不用检测。于是他又了，给我打电话说还是不行还是要检测。我刚刚也跟客户说了。 我说干脆让客户打钱到我公司账户上然后我在中国给他找个快递寄出去就行了。结果客户说找个很麻烦。因为之前没寄过样品。所以之间的一些问题不知道他说的什么意思。我把他说的原话贴出来，大家帮我看看是什么问题啊。跟有什么关系呢。怎么解决呢？ 我让他打钱到公司账户我给他在这里叫快递发过去。以下是他的回答： it would be ideal if we make the payment here as remitting to your account from india may arise questions and we may require your invoice and if invoice is raised, we must pay the duty and so on.??several headaches. i understand. but if we he to make a payment our bank would ask for invoice.??we cannot provide them any invoice.??only against any proforma invoice the bank would transfer the payment to you.??i you provide your invoice mentioning some charge for the tubes that would be appropriate to the freight value, our customs would seek us to pay the duty which considerably high.