Your position is strong given the documented inconsistencies. Your legal strategy should focus on establishing that the rejection was arbitrary, discriminatory, and violated the principles of natural justice. Some arguments to emphasize in your rebuttal to the respondent's reply:
1. Arbitrary Application of Rules (The Core of Your Case):
You must aggressively challenge the retrospective application of the 2016 rule to your 2013 application. Argue that applying a rule formulated in 2016 to a claim made in 2013 is manifestly arbitrary and violates your accrued rights. The authorities are bound by the policy prevailing at the time of your appointment.
2. Discrimination and Violation of Article 14:
This is your most potent argument. You have concrete evidence that pay protection was granted to other employees from CPSEs even with a lower CTC. The state PSU vs. central PSU differentiation introduced in 2019 is a classic case of "class legislation" without a reasonable differentia. Argue vehemently that this differentiation is artificial and violates Article 14 of the Constitution (Right to Equality). The employer cannot pick and choose beneficiaries for the same benefit arbitrarily.
3. Flawed and Opaque CTC Calculation:
Highlight that the CTC formula was undefined at the time of your rejection. The respondent's method of excluding employer's EPF contribution is a flawed calculation that artificially suppressed your previous CTC. Argue that a proper, standardized CTC calculation, including all standard components like employer PF, would have made you eligible.
4. Violation of Principles of Natural Justice:
Stress that no documents were sought from you in 2013, and the "rule was also unknown." This denied you a fair opportunity to present your case or clarify the CTC computation, a fundamental breach of natural justice.
Recommendation:
Your lawyer should draft a strong Rejoinder Affidavit focusing on these points. The narrative should be that your rejection was not based on a uniformly applied, pre-existing rule, but on a retrospectively applied, discriminatorily implemented, and opaquely calculated criterion. The court's intervention is needed to correct this administrative arbitrariness and ensure equitable treatment. The goal is to convince the court that the employer's decision was not just an error, but an act of patent illegality and discrimination.