I've sent Aetna every single piece of paperwork that I have but they keep asking for more, refusing to listen to me

On Sept.25,2015 I was injured at my job of 28 years. I reported the incident and on October 2,2015 I was sent to see our workman comp DR, who asked questions-did a visual and told me my injury was old age and arthritis. He told me he knew how hard my job was and he sent me back to work on full duty. On Oct,16,2015 I went to see an orthopedic surgeon who ordered an x-ray and MRI. On Oct.23,2015 we received the test results which showed that I had a right shoulder rotator cuff tear. He put me on light duty w/restrictions. I took my paper work to my job and returned to work on Oct.26,2015 to the plant managers dismay. On Oct.27,2015 I was taken off my job at 12:45 pm and was told that I was being taken off work at 1 on STD and would be paid in 2 weeks and I was not fired. My union president and I then went to the HRs office and she helped start my disability paper work. As of today June 13,2016 I have not received one check. The HR quit within 2 weeks-my case was then in the hands of corporate HR who quit just before Christmas along w/my union president. My company hired a new HR who refuses to help me and has lied against me several times. Aetna refuses to listen to me and I have sent them every single paperwork that I have but they keep asking me for paperwork while refusing to let me know What they want. I keep telling them I am not a psychic. I am the only woman left and have worked very hard at this steel mill plant!