What can a former employee report in regards to a former employees termination?

I was terminated as a culmination of a downsizing and total chaotic work issues. However, I was never provided written information regarding my work, nor was I provided an opportunity to see or respond to any issues. Lastly, the employer did not fight unemployment. Recently when applying for Federal contractor clearance, this former employer indicated I had been fired for inappropriate behavior and dishonesty. I was never provided any documentation regarding this matter. I know that my salary was only budgeted till closing, my supervisor and over 200 people were downsized during the time of August 2013 and June 2014. But why respond to an inquiry like this? This response on their part could prohibit me from being gainfully employed by my present employer. I am not a suit happy person, but I really don't like being called dishonest. And I have no way to challenge their answer. And while I was terminated, the company was and has sense closed the division I directed.