how to get details of a government servant about his requitm

Sir, there is one government servant who has reached to the peak of cruelity with poor s . but at the time of his recruitment he done a mistake. That he belongs to gernal caste but he fraudly get a false certificate of caste which shows him st candidate. . And because of that he got job from reservation qouta of st . Now i want a proof or a certificate of his job which shows his recruitment ST quota . I have also filed a RTI regarding this but the. Officer said no to reply on that . Please sugest me a way to get that details ..