Without binding, the amount you said should still be insufficient. Did you directly calculate the price of the goods?

If you send it directly to China, you need freight and tax. That tax was paid in advance. If it's not deducted after customs, it'll be returned to you. You should only see the price of the goods.

I'm in the same situation. I thought if you were dissatisfied with 500 yuan, you wouldn't have to pay taxes. Just calculated the price and freight of the goods, and it has been impossible to continue. Then I found that there was tax after the money was added, which was ok. The tax paid in advance for my 500 items is about 130 yuan.