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Valid problem

Hello, we purchased 2 ticket for Leonardo Express from Termini Station. We asked availability of our tickets to tourist information desks and they said ok. After arriving airport, an employee said to us our tickets should be valid for current time because our tickets are valid for all day and he took us 50 euro for each ticket. But we didn't see any validation machine near the train or someone to said to us about valid. What should we do? We did not any information about valid!!!!!
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