Part of salary not paid

Dear Sir I am working in reputed telecom company since last 3years , my TCTC is 415000 in which 13% amount deducted per month as performance level indicator , as per HR policy if your rating by reviewing manager is 2 out of five no performance bonuses will be given either it is part of salary , now I have awarded with rating of two , they given certain reasons major reason is of transfer to other location that is only discussed verbally on same salary along with current responsibility , I denied same time that two responsibilities on same salary is not justified, i said transfer me but remove current responsibility. this communication was verbal , my current performance and goals set in starting are absolutely achieved but higher management decided to make pressure on me with degrading my performance , I have my goals in writing and achievement also , Kindly suggest me should I go to labour court