Termination/ Wrongful Accusations

I recently got fired from a factory that I have been working at for 3 years. I have never missed a day of work or even been late. I work all the overtime I can and work to the best of my ability. I have always put out almost double the amount of quality products that others do. My employer recently started accusing me of having poor workmanship and I also got accused of yelling at a female co-worker. These are false accusatons. My employer gave me a warning and switched my shift to 1st shift. They made it very difficult for me to work overtime and were very short and rude to me. After about 3 weeks of the 1st shift my employer laid me off while keeping temps and other employees that are not as hardworking as me. I am 4th in the line of seniority and feel that this is not right. For the last week I have been laid off and am recieving unemployment as of right now, but I just received a termination letter in the mail. There is absolutely no reason that I should not have a job right now. Is there anything that I can do? - Is this your question? Add additional information