Battle with MetLife is like battle with cancer

I have filed a claim for short term disability which started on 01-21-2015 and per the form my doctor filled out, he put return to work date 06-01-2015. Someone at MetLife decided my claim was going to end 04-19-2015. I am currently going through radiation treatment for triple negative breast cancer and trying to speak with the case worker assigned to me I am getting told that I or my doctor needs to provide more paperwork. Every time I speak with her, it is a round and round, get no where battle other than for her to tell me my benefits are going to stop on the 19th of April. I am still going through radiation treatment and have follow up appts with my radiation oncologist and medical oncologist well beyond the 19th.