Do I have a justified claim against my previous employer?

I was terminated for being paid commission on a deal in which I had a signed contract that the client did not end up paying for. I received a $25 commission for the deal and rather than take it out of my following check they chose to terminate my employment and I am also not able to qualify for unemployment. When I first started with the company I took over a center that was being driven to the ground by the previous sales and operations team. The sales manager ended up being transfered to a larger center and the operations manager decided not to show up on my first day taking over the center. My boss decided to transfer someone that she trusted over to my center to clean up the billing/accounts payable items that were not filed correctly and in most cases there were no signed contracts for our clients services. The client files were not filed at all correctly. I was told that I would be trained for both roles however I never received the proper training on the Operations Manager role. The person that my boss transfered over ended up stealing well over $5k from the center without my knowledge and was terminated shortly after she was promoted to another center. I ended up getting a verbal warning for her theft even though I was new and was told by my boss that she trusted her to get the center back to where it needs to be. I was one of the top sales people in my area prior to being terminated. I was told during the termination by my boss that I was being terminated due to being paid commission on a deal that we did not receive payment on however she did mention the theft of the previous OM as well which I found completely unacceptable since she was the one that vouched for her. My boss did confront me about the signed contract I received without payment and the client was going to drop a check off however I and my new Operaitons Manager were unable to reach the client to get payment. The client ended up being sent to collections and I ended up being terminated rather than taking the $25 commission out of my following check. Do I have a leg to stand on here? I never received the proper training for my position and the sales manager that I replaced who was basically given a promotion never received any type of warning for his part at all. It doesn't sit well either that I was told by my boss that she had someone she thought was better for the role during my initial interview however that it's all up to her boss. Please advise.