Incompetence of employees causing clients to lose time and money

I am extremely disappointed with the work of the Pošta Crne Gore branch in Zabjelo and with the incompetence of its employees. A month ago I sent a registered letter with contents to the USA. Before accepting the item, the clerk even consulted someone by phone to check whether sending it was possible. After that she accepted the item, I paid the postage and left, believing that everything was in order. However, after only a week the letter was returned to me because customs had not let it through. Attached to the item was an official explanation from the customs service, addressed to the employees of Pošta Crne Gore. It stated that since August 2025 it has not been permitted to send such items to the USA, only ordinary paper letters without any additional contents. Moreover, the customs service expressly asks post office employees not to accept items that do not meet these conditions. A perfectly logical question arises: how is it possible that post office employees are not familiar with rules that have been in force for more than a year? Especially bearing in mind that the clerk even checked the information by phone before accepting my item! Why should a client pay for a service that the post office, because of the restrictions in force, cannot carry out at all? Why does the customs service have to remind post office employees of rules that they themselves should know? Because of someone else's incompetence I lost time, money and nerves. I consider this situation absolutely unacceptable. A client is not obliged to research all international postal restrictions on their own. That is precisely why there are post office employees, whose job is to know the rules and provide accurate and reliable information. I hope that the management of Pošta Crne Gore will pay attention to the expertise of its employees and ensure that they are adequately informed, so that other users do not find themselves in a similar situation.