Non returning my original documents

I was working in a public school and i joined in August 2016 At the time of joining they told me to submit my original documents with this contention that it will be confirmed by education authorities and gave me a receipt of these original documents They also got a one sided appointment letter signed from me in which it was written that i cannot leave the job before completion of session and didnt gave me a copy of this appointment letter .After working there i found the working conditions pathetic and gave athree months notice in November 2016 which they refused to accept with this contention that they will not leave me before completion of session although kept the resignation letter with them and told me to leave after practical exam of 12 standard .In the first week of February 2017 the practical exams were over Unfortunately i met with an accident while going to my home from school in second week of february 2017 and i informed the school authorities about the incident telephonically the other morning Now when i had recovered completly from my injuries i asked for my original documents for which they are refusing and asked for my resignation and medical and no dues although i have nothing belonging to school with me I was ready to give resignation again give my medical also but for no dues they are saying that they will get it signed and god knows when it will be complete and after that they will give me my originals although they know that i have nothing with me ,this is only a way of harassing me Please give me a solution to it