If your order was over the free shipping threshold, the free shipping discount should have been applied at checkout, this would cover the cost of shipping your order to you.
However, some countries may be required to pay tax & duties upon arrival which will be applied by your local customs office. Upon ordering you are unable to proceed to checkout without acknowledging the potential duties and taxes you may be faced with (tax & duties may be calculated against the order value prior to any discount or sale prices being applied).
For delivery to any of the countries listed HERE any applicable tax & duty would have been charged at checkout and you should not be subject to any additional charges.