Stuck in the ba*****t

We booked a much anticipated holiday at the city lodge waterfront about six weeks in advance. We have not had a holiday in years and this holiday became a reality only through stringent savings and budgeting. Once our booking was confirmed I called the hotel reservations to ensure that they reserved a room on a high floor with a mountain view. It was all arranged. We checked in today and were given a room on the floor below the ground floor. Level zero. We are staying for 14 nights, not just a weekend.The reception is unable to assist.I am so disappointed with the room that tomorrow I will be seeking alternate accommodation. Why did city lodge assure me that all was in order only to find that I have been given " a room in the ba*****t". It's unacceptable and I cannot believe that they cannot remedy the situation.