How do you deal with the corruption of an Arizona EEOC case such as this one?

I have a case from Arizona where the company and insurance carrier did a forced termination of employment and benefits due to health complications from a colon surgery and their managers hostile and even violent attacks against me when they attempted to force me to resign. I filed with the EEOC in Arizona and provided voice recordings of the managers threatening me along with a medical report where it is documented that HR tried to get the doctor to endorse fraudulent charges against me so they could terminate my employment (It also states in the medical report that HR was trying to do this since I tried to complain about a managers violent behavior) and I also provided a memo from the company's own files where it clearly states they were terminating me from the company in order to prevent claim to disability benefits. This EEOC person rejected the evidence, read a letter from the company that only kept stating how they were the greatest for employment opportunities (Not answer any of the charges) and then they rejected the claim and closed the file. I attempted to appeal this action and was then threatened with having a serious injury if I pursued this course of action against the company. Is there any thing one can do to fight this??