This happened to me twice this trip? When buying any tickets from the train station please check the tickets is the one you wanted and the price matched with what you paid. It seems to me the station staff might be pocketing the money by selling wrong tickets (cheaper price) tickets to tourist, e.g. You buy 180 minutes tickets and they give you the 60 minutes one. This seems to me a common practice as when I talked to station staff in naple who are checking tickets, they acknowledge there is a problem and they want to crack it. Good luck to them !