My company at the moment is having a quite terrible story with UPS Poland.
To begin with, they should have sent cargo to the client's city, but when he came to pick it up, they asked him for the documents and suppliers confirmation, what he had already had.
Later on, we tried to contact them, but they didn't give any new information, and two different support even gave me complitely different excuses.
So for now we don't know what we can do and how we can solve this problem, their line is always busy and no solutions were offered.