Unable to pay Bond in PSU

Hi all, I was a fixed term employee of a PSU whose condition is very uncertain as everyday some news comes about disinvestment, privatisation and shutdown if not privatized. They haven't given any benefit as per the rules of FTE. Everyday we were facing discrimination among FTE and Permanent people. I left the organization by intimating them through mail with my proper concerns. They didn't replied to that mail till 12 days and then I called them to know the response, they asked me to give the resignation through proper channel. I have given the Resignation letter but they are not accepting it as they wanted to recover the bond amount of 7lakh for 5 years. I don't need that experience letter. One of my colleague left from there and joined another central government job but they didn't transferred the bond as they said it is valid for only permanent employees. I was having 3 offers when I joined this PSU (just because of PSU name). After joining there, I faced discrimination among permanent and FTE. They didn't gave anytime shift allowance at that centres but other centres, they gave. Also we didn't receive our very small salary (for Tier 1) at proper time. We talked to management but nobody can listen to us as we are FTEs. I decided to quit as I don't see my future there. Now they send unauthorized absence at duty letter and also a liquidity damage letter. What can I do ? As we are young guns from different (Electrical/Electronics) background and we are studying mechanical subject and if after 1 or 2 years, this company will be privatized or shutdown, I cannot go back to the knowledge which I was having previously & no other companies will give us job. What will be our future then as Jet Airways employees have faced ? So I left to prepare for other jobs.