Resignation from PSU after asking for adjustment of EL during notice period

I am working in a navaratna PSU (BHEL) for the more than 10 years in same department. I never got transfer to any other department even after trying so many times. Now I am totally frustrated and want to resign from my job. My notice period is 3 months. In my service agreement the following is mentioned: “In case you wish to leave the services of the company after completing the stipulated period of 3 years service, you shall give 3 months notice to the company failing which you shall be liable to pay the company compensation equivalent to 3 months salary. On resigning from the job you will be relieved only on resignation being accepted. The management reserves the right not to accept your resignation, if the circumstances so warrant. Acceptance of payment of salary from the employee in lieu of full or unexpired period of notice will be at the discretion of the management.” If I submit a resignation letter showing some family health problem and mention my inability to work efficiently in future for this company due to this problem and also request to adjust my earned leaves for the rest of my notice period; please advise for the following consequences: 1) If my senior officials do not accept my resignation mentioning any reason (eg. No substitute available at this time, etc.), how can I get relief from this job? 2) If my senior officials do not forward my resignation letter and sit idle and try to torture me or put extra pressure on me to work or harass me by vigilance enquiry, and being unable to handle that torture I apply for some leaves due to my emergency duty towards my family, but the leave is not accepted by senior official and still I go to home town by sending an email informing the same and also mention that I have already submitted my resignation letter due to the same reason, then what maximum action company can take against me? Do the company have the power to force an employee to work who is not interested & has already submitted resignation letter and asked to adjust earned leaves against the notice period? Can I face any difficulty in getting my due payments (EPF, gratuity)? In that case how can I get back my due payments? Do the company have the power to forfeit some employee’s EPF or Gratuity amount? 3) Please advise how can I get relief from this job easily and also get my due payments in time?