Correction in Service Book Date of Birth

Hi I am govt worker joined in 2012 all te submitted my originally verified documents Adhaar And Pan Card as mentioned Clear Date of Birth in my all Documents 12/12/1973 but Department generated my date if birth in service record book 01/01/1968 totally wrong changed by senior officer I don't know about him. I got pention card in 2017 I got wrong date of birth and I was informed to concern team and clerk of my department requested to correct my date of birth in that . And after toward I noticed my work documents all geneted with wrong date of birth again I am trying to make correct but nobody helping me in this regarding of department . clerk also not helping or guiding me how can correct it even I don't know I how to request where to submit my request correcting date of birth in my record book approximately 3-4 years I am facing trouble an frustrated . retirement date as mentioned on joing date 2030 about 18 years of working now its seems less then from 18 years its about 2027 of retirement I am worried about it because I need more years of work as it on my duty. Plz help me how to solve it.