Domestic violence by mother-in-law

Hello, I need urgent help. As my marriage life spoiled to very extent. My mother-in-law is demanding dowry since months and started giving mental torture from the first day of my marriage. For this she always involves her sister into this matters and takes her provoking statements towards my married life. And also she is the main culprit. They both don't let my husband to be with me since my marriage. Everytime I go to my in-laws house she used to torture me a lot and she always have call conversations with her sister about my marriage life matters. She wanted all my salary to give in her hand which I didn't agree. And she don't let her son to work/ do any job. Many times he quited from his job for harassment. Also she don't let him go out alone always she wanted to take her with him. And she didn't allowed me to go to any temple/ hospital/ any other place till date. She started harassment for me about my husband also as he is not employed, firstly she does'nt allow him to go for a job and tortures me by asking for car and gold and other valuables. I have 5months old son. She didn't let her son to meet me and my son after my delivery. And didn't agreed to come to her house after delivery. My parents spent alot on my marriage. Soon after my marriage she started torturing me for dowry and used to tell lies about her family background and always try to separate me and my husband. She and her sister mentally harassed me to quit my job and in my 7th month of pregnancy she thrown me out of her house and my husband kept quiet at that situation. I'm not saying my husband that not to listen to his mother but there will be some situations to react and he didn't do so. I don't want to give compliant against my husband as he is so scared of his mother and listens accordingly but he intentionally won't hurt me. As Yesterday we had a big quarrel at home and my mother-in-law provoked my husband to beat me and also he took my son from my hand and ran out of the house. On seeing that I made a call to police but not received any proper response. My husband is under the control of his mother. And he don't even give any call without her permission till date. My mother-in-law beats my husband if he denies her words and doesn't allow him to do any thing without her permission. She is a big spyer, where she always looks into our room by hiding near my bedroom. Also tries to listen to all the conversations what we talk. And doesn't leave him alone. Please suggest me what to do.