My pay was cut 4000 per year

I was hired as a Mechanic at #### Collision Albuquerque NM late December 2006.
The General Manager agreed to my asking salary of $50,000.00 anual, he declined to give it to me in writing.
Though on my first paycheck I could see a shortage, I brought it to his attention and he refused to discuss the matter.
My 90 day review as described in the employee handbook was also declined.
After some months I had the chance to talk to the owner about this matter and he said he would review at the beginning of the year.
Several months later I brought it up to him again and he blew me off.
A couple months later I am now fired with no reason and denied unemployment benefits as I find a new job.
So now I'm out of a job and $6000.00 lost wages that were agreed to.
Do I have any case at all?
Thank you for your time.