My order arrived in my country but I got an email from the customs office

Non-EU customers are subject to the laws, duties and taxes of their destination country. Depending on the value of your order, it might happen that you have to pay additional import fees on top of the already paid shipping costs. There is no way for us to calculate or estimate if and how many import fees you might have to pay when your order crosses your border. Unfortunately we're unable to help you with this.