boss fired me and refused to pay me, what should i do?

I was contacted by a restaurant owner. I was interviewd an i was asked to come for training the following week. I was excited, but that excitement was short lived. I was there for about a week only. I badly needed a job. Boss was very ARROGANT and full of himself. He was always singling me out during the traning and always trying to embrass me and make me feel like im stupid. Anyway, i stil worked hard to impress, i did everything i was asked to do. Then one day in the middle of cleaning and setting up restaurant, he called me and told me i could go home because there wasnt a lot of work to do. He saw i was doing something and was buisy but he didnt care, anyway i went home. The next day the restaurant officially opened. I got sent home on my first official day of working. He told me i wasnt working hard enough and then confused himself and said hes sending me home becoz theres not a lot of work to do. I think he just wanted to get rid of me for whatevea reason. I went home and i wanted to cry but i didnt. My feelings were hurt. Weeks later they sent me a letter saying they fired me.Anyway, i was there for one week including training and they didnt pay me not even one cent and im very angry. I spend a LOT of money on buying uniform for work. I spend money on fuel. Woke up every morning, and worked my butt off to impress and in the end got NOTHING ,NO MONEY. Its almost christmas and i dont have any money to spend. i am really angry and i feel they just used me like a slave.