What to do when my research findings do not match up with the literature review?

My thesis is due next month, and I have been stuck here with my thesis! The findings of my research are totally different what I expected them to be. My literature review and the objectives of the study were aimed to study something else, but now I realize that it wasn’t what I expected. My research has gone awry! If I promised to study ABC, my data analysis gave me the answer xyz of another question which I didn’t even think about. How can it be completely opposite! I guess the questionnaire is to be blamed for this for I didn’t check its reliability before-hand. What shall I do now? If I change the objectives and literature review of my thesis, won’t my proposal would be questioned which submitted to the committee? I have no idea what to do. In such a short time, I could not re-analyze my data!! No idea guys, please advise!