Employer Doing Document Forgery & Cheating Employees

I was working with an organization for the past 3 years. We had the leave policy that was uploaded on the company's HRMS portal, it said that leaves will get encashed as per Gross Salary.
I was offered a cross-department promotion sometime in August 2018. I refused the promotion and told them that I would not be able to do justice since I will be leaving in a few months. This entire conversation was verbal, done through a skype meeting.
On Nov 21, 2018, I resigned and with prior discussion, my last day was set to 31st December 2018. However, it got extended to 10th January. Till this date, we never received any communication regarding a policy change in the Leave Policy.
I can see that they have uploaded a new leave policy on 14th February 2019 and made it effective from 01st of November. So, they are creating backdated documents and policies, to cheat their employees. 
Can I file a criminal case against them on the grounds of document forgery?