Evil Customs

I'm sure that every cel collector has had a similar (or worse) experience with customs, but this one was too ridiculous not to share.
I received a customs invoice requesting the receipt of purchase. This was a fairly expensive order, so if not charged right, I was going to pay a lot. I can send the receipt by mail and wait to get the package at home, but since I don't really trust customs, I decided to go there myself. This is what I usually do anyway.
So I get there and ask for my package to which they tell me I have to pay a huge fee. Way above of what I had previously calculated. I asked why and when the receipt that came with the package was shown to me, I laughed inside. They were basically charging me for deputy fees aswell. I complained and showed why that was wrong. They were also trying to charge me the full tax, but, at least in my country, tax for artwork is lower than everything else. Since they don't even know what a cel is, they wanted to charge me the full tax. Eventually everything turned out ok. I was charged only on goods price and with the proper artwork tax, but all that because I actually went there myself. If I had sent the receipt by mail. I would probably have received the package a couple of days later, but with a huge tax fee...Evil customs...