You must file a formal complaint to your HR and simultaneously lodge complaint before the local police along with copy of the complaint given to HR. You have submitted your original certificates to your employer in compliance to the bond obligation. Had the bond obligations were not enforced upon you would have not handed over all your original educational credence. Hence, the amount equivalent to the bond may be claimed as compensation which would also cover their deficiency of service and dereliction to duties of an employer towards its employees.
After getting report from the Police authorities, It is advised that you may submit application and apply for getting duplicate educational certificates form respective educational Institutes.