company not giving relieving letter as i did not keep them informed

I had fallen and had low backbone ache, I was not able to continue to work as the company doubts I am lieing even after producing the documents. I failed to keep them updated due to my family issues that happened in sequence. But my father and me both apologised after a week.. However the company declines to understand and help me get relieved. I am at home from 2months, with pain and I would like to look for a job in future in my native and need my relieving. Company says dey have considered as absconded, for updating them late. Pls help me what can be done.