498a filed based on extra marital affair

I have married my wife through a matrimony site and she has accused me for 498a stating we are not ready to give her belongings back to her which includes her jewelries not much left as she has taken some already and her clothes too. We are only married for 5 months out which we have stayed together for 2 months only after which she used to always go back to her parents house. When it was a time to travel singapore , go to bali , visit sentosa island she was all in with me and happy about it but then when we used to be back she picked up fights stating i have extra marital affair and sometimes allegations of impotency asking me for a treatment. Because we were searching my bride on matrimony there was other girl too that we were looking as alliance but then we decided on my wife whom I got married. Now she has created a scene with that girl that she was rejected because my wife was earning more than her and now they are also involved in all this blaming me of extramarital affair. Since last 2 months I have not stayed with my wife . Now the in laws are asking for 40 lac rupees and divorce from me. They have unnecessarily pulled my mom in this. Now because they are not able to prove dowry and harrasmment they are putting blames of extra marital affair on me in 498a. Need help. Also they had barges into my house and spoke in a very bad manner with my mom and aunt which was insulting .