请大家帮我翻译下下面这段话 ，用英语，不要机器，可以让客户明白意思。我是做油画的。，很急 拜托大家了

Dear XXX,

We have checked with TNT, and the extra cost is not charged by TNT. The cost is for the import tax of the Custom of your country. The TNT paid the tax first during the import process, then TNT has to charge this tax on you. Thanks for understanding.

Dear friends,
We have already contacted the express company to find out what happened. And the fact is that the customs duties when entering your country took extra costs. TNT has paid for it for you, so you should give it money accordingly.