Service Agreement Bond

Hello everybody, i am working in a central PSU where i have signed service agreement bond to serve the company for a minimum period of 5 years or to indemnify 6 lakhs if i break the bond. Now i got good opportunity in other PSU & i have to join there within 30days. So i have submitted my resignation letter to my present company and they are asking me to deposit 6lakhs for relieve me. As i have not applied through proper channel the service bond may not be transfered. Actually the Training costs incurred by the company are not more than 2 Laks. (which i sought by filing RTI) In this case, they are not even allowing me to deposit the proportionate bond amount i.e 2,00,000/5*2.5= 1,00,000. ( As i have already served the company for 2.5yrs) or proportionate amount of 6lakhs i.e 6lakhs/5*2.5=3,00,000. I am in a big dilemma whether to file a writ petition. Kindly advice me. 1) If i file a writ petition in how much time the case may be settled ? 2)Will the court order to pay the proportionate bond amount.? if yes will it be 1lakh or 3 lakhs? Please Advise.