How to add Two wives names as nominee in service register

Hello, Good Evening, My name is Hasan Saheb, AR Head constable in Andhra Pradesh. I have been in service since 1982 and going to retire in 7 months. At the time of Joining into services i was married and entered her name as Nominee. But for more than 8 years we could not have children. Hence with the acceptance of first wife and her parents i have been married to another woman who is relative to first wife. My second wife gave birth two sons and fortunately my first wife also gave birth to child.we all lived together in a single home for more than 20 years. later when the children got married, my first wife and her child moved apart from us and started living separate in another town. This happened in 2014. In the mean period they never cared about my health or well being. every time they use to call me and demand money from me. I use to give little which i can afford. They are never satisfied with what i use to give. Now months before my retirement she complained to Superintend of Police that i am not looking after her and hence to allocate half salary and half pension and Solo nominee after my demise. when enquired about the issue, we came to know that nominee details were entered mistakenly in my service book i.e., Name of first wife and photo of Second wife are written as nominee. Now my colleagues are threatening me that it comes to cheating the government and I may be sentenced to jail for the same. Now what should i do. I want to do justice for two wives and three children. Can i add my wives names as nominee in service register as polygamy is accepted according Islam law of marriage