Questions about tax settings and import VAT

[rapidturtle]

Hello,

I'm registered as micro entrepreneur in France.

I'm based in Korea now and my products are shipped from Korea.

Since I'm just starting and I don't pass the threshold for the VAT, I don't collect VAT.

However, I recently sent a product to a customer in France.

She told me that she had to pay import VAT of 20% of the order to receive the product.

I don't collect VAT on orders but why do my customers have to pay import VAT?

What can I do to make sure that the price the customers see on my site is the final price they have to pay?

Thanks!