unfair dismissal

my facebook account as been cancelled and i think its unfair i dont no who to contact as i would like to go back onto using facebook i did use it alot to talkj to my family as they live away from me i did download some music of you tube onto facebook why is it advertized on youtube if you cant down load i thought it was ok to do as there is a down loading site on youtube for facebook is there any way i can use facebook again can you help me please