I am sorry to hear the news greenbelt, I understand how are u feeling right now because like u I have a failed visit visa application before..
wait, when they returned ur documents do they included a form for appeal? coz if not, that means u cannot appeal with their decision..anyway, like Boss Keith have said most of the application were failed because of lack of docs, u can still try it next time if u want just make sure u have prepared for it all the documents needed are there even more than what they wanted..