Subway complaint: Terminated for no good reason

I was employed at this subway for about 4 months. I enjoyed the job and interacting with guests. I enjoyed it until the manager started having me wash her dishes she didn’t want to do almost everyday, treating me badly, and not helping me when she was there. One day, it was a Saturday, she texted me and asked if I can come in and work, to which I said I couldn’t. She told the guy that was working that night to leave the dishes for Doug. So Sunday when I get to work, there is a pile of dirty dishes. She waits until the end of the night and tells me you’re gonna do those dishes. After saying earlier that the guy that closed the night before left them. I was angry but I still washed them. I was off on Monday. When I went to work Tuesday, the rgm called and told me that the manager was unhappy with my performance and I was being terminated