Ruby properties in Dublin

The stay at the hotel was perfect, the cleaning was good although they forgot to put us tissues during all the stay, but everything was very clean. However, there was something we didnt like. We had a one day trip and had to wake up very early. We had to leave the hotel at 7 am, it was a Monday, so the day before we asked the receptionist, she was very kind and told us that we could come at 6 am to have breakfast since most of the things would be ready before 6:30 am (the time they open the breakfast room). We came at 6:15, just 15 minutes before the breakfast started but a rude lady (from the night shift) told us that we had to wait until 6:30. We were confused because they had assured us we could get something for breakfast, but she repeated that this was not possible. I couldnt barely reply to her because she left before I could finish the sentence