Retaliation

I work for a "big" company. I turned in a deposit which is a daily routine for my job and left for the weekend. When I returned to work my boss told me the deposit was short and I had to pay the money back each week out of my check. I never received written notification, as I was supposed to and the company began withholdings. I spoke with a lawyer who wrote a letter to the company stating that they were breaking the law and to return my money and any further withholdings and not to take retaliation against me(in brief). I hand delievered letter and 2 days after my boss read it they fired me saying I was not trustworthy. I have consulted back with a lawyer he said I have been screwed majorly but he did not handle retaliation cases. No income and trying to find a lawyer is hard. Do I have a case or should I just give up and they have further ruined my job security for future positions.