Is a job contract (bond) valid

When I joined with a company as an executive trainee after my MBA, the company had forced me to execute a bond to serve the company for 5 five years, provided I am successfully completing my training (for 2 years). Actually, the company had not given any training and they were literally using me for carrying out their day-to-day activities. Since there was not a congenial or professional working atmosphere, I resigned and joined with another company before the completion of the bond period, i.e. after 4 years. Since they were financially sound, by engaging a renowned advocate, they filed a suit against me won in the district level court. Due to the laxity of professionalism, many young professional in the company are following my path and using the money power, the company is fighting against all of them in courts. Now, they are manipulating the law and using it for making money. Since these types of companies are damaging the future of many young professionals, I would like to fight it out in upper courts. In this connection, very humbly I request your valuable opinion. Thanking you,