Family Dollar complaint: Wrongfully fired

I was just fired and didn’t get a two weeks notice. I made a mistake and instead of being suspended or disciplined I get fired and I done my job every day and kept my store looking good and made sure freight was out of the stockroom and I feel like there should be punishment but I don’t think I should have been fired cause I really love my job and I learn from my mistakes and I’m honest and I don’t steal and I was learning every day so how can one be a great manager if they cannot learn from there mistakes and grow?? We are just treated expendable and only the managers who are favored get away with things they shouldn’t and the ones who make a mistake get fired so I don’t think it’s fair or right. I want my job back or I will have to talk to a lawyer cause it’s unfair how I been treated and I was told after two weeks I would be off probation and I been there close to six months as a manager and I wasn’t took off when I was verbally told I was so you done me wrong and I wasn’t told what I was going to be payed or any of that so it’s unfair and wrong