A.B. Dange has declared in writing at point No.5 there is practice of service notice of change in CDA rules to Local Labor office, Union or employees. You have already shared your observation on backdated insertions on intranet.
You have enough evidence of victimization, corrupt, unfair and illegal practices, connivance, and collusion.
There is a govt. nominee on board of the company. You have appraised one and all.
Since the practice continues, you may address a communication to PM/President.