billgates:
I have already paid YouShop all the customs and GST fees via their portal when it arrived at YouShop at their USA warehouse which was a fair bit of money as shown below.
Sorry the number is no longer valid. I've used that number in the past to get the Customs reference numbers and pay the fees before receiving the very, very slow letter from NZ Post requesting payment. If the image is correct however, and the item is still stuck in the US, it's possible no Customs number has been assigned.
EDIT: I see it has arrived in NZ. In that case, I would ask for the Customs reference and pay Customs directly. Once NZ Post has proof of payment, you can collect the package yourself or they will forward it for delivery. Then insist on a refund of the fees paid. If they ignore you, chargeback on the basis that they didn't provide the contracted services or act in good faith.

