Certificates which are held by an organisation

Hello Sir, I am Swathi. I completed my engineering in 2014. After the completion of my graduation, I joined in Transdyne, Hyderabad under some bad circumstances. The company had a bond of 2.5 years which I signed and for surity, I kept my 10th, inter and engineering memo along with provisional certificate as I didn't have money to keep for surity. In 2015 October, my father is expired due to cancer. After that I had to take care of my family which consists of younger brother and a younger sister and I am the older one; my elder sister is married. In Transdyne, I used to get merely 8000 (incentives are included) and my basic salary was only 7300. As I have to support my family, I searched for another job and I got that. The salary was some how better in the new job but now when I went back to my previous company for the certificates, they are refusing to give them back to me. They want me to pay 80000 which is almost impossible for me. They are even refusing to decrease the compensation. They want me to work for that company again which gives me a lot of stress. Sometimes I am feeling like suicide is the only solution I have for all of these problem s