Beware Admin fees and bad attitude

I recently bought a small electronic (tracking device sample) from Taiwan and paid courier fees to the supplier. I have just received the article and was not only charged customs fees (which I'm happy to pay) but an admin fee for clearing. This is why a courier was used - fees are high and clearance should be included. When taking this up with TNT accounts, I was treated like a retard who doesn't know what I'm talking about, and was repeatedly interrupted with the accounts person talking slowly and loudly so I could \understand". When trying to explain my point"