Wife demanding huge amount

I'm working as a software engineer and earning around 1 lakh whereas my wife is also working in an IT company and earning around 20K per month. I have been married to her over 5 years and she always fights over petty things. I have bought no property till now and residing in my parent's house along with my wife. I'm from Bangalore and she is from another neighbouring city. In these 5 years, she has made our life miserable by arguing/fighting with my parents, she goes out without informing for hours together, she even got black magic done and placed some number cards given by astrologer under my bed. She got this IT job and never informed me about this. Her father is a police sub-inspector in her city and keeps threatening me and my parents. In addition to that, I'm having problems where my sperm count and quality is very less and unable to give her a child. They are considering this point and call us regularly over phone and keep shouting at us saying that I'm not a man and an impotent. This has made me mentally very weak. She demanded for a mutual divorce which I agreed and now she is demanding huge amount of 60 lakhs and 1 house in her name in my city. She argues that she does not want to go to her city and wants to live in Bangalore and continue working. I cannot afford to give 60 lakhs along with a house to her and denied the demand. I made an offer as maximum amount of 20 lakhs is what I can provide and nothing more than that. But she is not agreeing for it and demanding a house to be bought and handed over to her or else her father threatens to take action against me and my family. Please let me know what can be done from my end and any precautionary measures to be taken ?