False case filed u/s 498a against mother in law and husband's sister in other state where they gone

My wife's brother have left home in 2013 and he settled in Madhya Pradesh. He loved a girl there and married her in 2015 and till July 2019 they both lived together in MP it self. Recently he started calling my wife's mother and asked for a huge amount which she can't give. So they came to my aunt's place and started spreading lies about my aunt, my wife and my self on Facebook. We complained to the local police and they warned them. Then they both gone back to Madhya Pradesh and there filed a case in women police station u/s 498A. She knows only Hindi and my wife and aunt only knows Telugu. We have never stayed with them even for a single hour. Never spoke to her over the phone.. they even don't know my wife and my phone numbers untill they came to my aunt's place in July 2019. My aunt or we even didn't attend his marriage. He even didn't come to.his father's funeral. If I have to file a squash petition..Where to file it? In AP high court or in MP high court ? What are the other remedies for us ?