I was fired from job stating that I violated company policy/No Call No Show. This was untrue as I has submitted medical documentation to my supervisor

My husband called my supervisor on April 15, 2016. I spoke with my supervisor on April 18, 2016. I emailed medical documents to my supervisor on April 19, 2016 which stated I would be released from medical care on May 4, 2016. I received a separation notice in the mail on May 3, 2016 which listed 4/12/2016 as my determination date. This date is inaccurate as it is the last day I worked a full shift. When I filed for unemployment it was determined that I did not violate any company policies and had followed protocol. I contacted HR to ask if when I would receive my sick pay compensation. She respond No pay was due according to company policy. In addition, my supervisors response to the Tennessee Department of Labor was that a person in my same position told her that I was getting ready to quit anyway! What are my options, if any?