Translation of saboteur in Spanish

We drove to the hotel Rex where we made reservations in advance. However, once there, two American guys told us that they had a voucher from a travel agent and the price was like half of it.
If you have trouble in expressing something just write it down first. This site is very helpful to learn languages. I think it's very good to have conversations with other people. Take care.
If we had more time, we would have stayed overnight in Aguas Calientes and visited Machu Picchu before 10 a.m. when the crowd (from Cusco) arrives.