PLI (performance linked incentive) promised not being paid

I have 2 queries: 1) When I joined my ex-Company, I was promised a CTC (cost to company), which included a PLI portion. Over the years, the Company increased the proportion of PLI in CTC. Though at the time of joining, I had negotiated on the total CTC, the Company puts a small clause in the appointment letter / subsequent annual appraisal letters that CTC will depend on employee performance as well as Company performance. I have been performing very well & got good ratings also, but the Company has not performed well. As a result, the Company has paid PLI only at 65% of the PLI promised as pert of CTC, resulting in reduction in CTC. Is this allowed? I want to file a case against the Company for the same. 2) I left the said Company on 1st Feb'16, thereby serving 10 months in FY 2015-16. But the Company will not pay me proportionate PLI since I have not completed full year's service. Since PLI was 28% of my total CTC, I will suffer huge loss. Is the Company allowed to do so?