Reservation conditions not matched due to broken carriage - compensation/refund possible

Hello,

We had a reservation from Budapest to Bucharest on the 13th of July, departing 19:10 from Budapest. . We had two tickets in a private compartment (2 people), however in the train the supervisor told us that the carriage was broken and we travelled in a four people compartment, despite we paid the full price for the 2-people option. Is there any possibility to ask for a compensation/refund, given that we travelled in a category different from the reservation?

Thanks and regards