Illegal affair conversation through watsapp

Hello, My wife had an illegal affair before 4.5yrs with a person... I caught her by her watsapp messages... But fortunately I lost her phone... But only thing is I have the screenshots of that conversations... But my lawyer is saying it will not be proper evidence to prove for my divorce case... I have a 9 yr old son living with my wife.. After 9 months of my applied divorce case my wife applied DVC and MC.. she applied DVC without nothing happen... So my judge disposed DVC but without any reason he gave me the order to pay rs5000.. he declared rs15000 as maintenance from date case filled... We have seperated from March 2020... I filled divorce case March 2023... She applied DVC and MC February 2024... I got judgement two weeks before... I don't have any property as i transferred my assets to my mom before I filling divorce case.. I lost my abroad job as I am seeing my case...but now I don't have any job and getting psychiatric medical treatment and my doctor saying it's everything full of stress and depression.. how can I reduce MC amount and how can I get divorce... My wife is working in IT field of very good salary.. but I cannot able to find her office and salary details to prove... My didn't choose a proper lawyer for both the cases... So for my higher appeal i decided to change the lawyers... Many evidence which i had was not submitted in past cases.. My job quitted evidence and my medical expense history evidence like everything was not submitted... My divorce case is pending and I got judgement for DVC and MC.. She is using my son as a weapon to get money from me .. Please give me the proper solution for my cases.. I want that watsapp chats.. how can I get legally... Is any way to get that chats... I want divorce so what I have to do... Pls help me kindly do the needful...