Sexual and Mental harassment by Father in Law

After a couple of months of my marriage (Nov 2016), I noticed few misbehavior by my FIL when only we both used to be there at home. He was taking advantage of my husband attending the weekend German language coaching classes. Gradually he started inquiring about the relationship between me and my husband for which I was not answering. He was even speaking about the sexual relationship between him and my MIL. He used to praise beauty of my mother and other ladies. He used to praise my beauty and also talk non-sense on phone calls from which I got to know that he used to smell my clothes from the laundry basket in my room when I was in office. He never missed a chance to kiss me or hug from behind touching my private parts. He was making false promises on his wife and son saying that he will support me. He used to blame them and was speaking against them. He used to invite me for movies on weekends and also he used to get my favorite dishes to impress me. I stopped talking to him for which he confronted me. I clearly told him that I am not liking his behavior and he cannot touch me for which he answered "But I like to do all such things". Then on my disagreement, he accepted that he will stop. A week after, he forgot his words and even asked me for sexual favors. Immediately I came to my room, locked the doors, called my brother to visit our home and kept myself busy. Meanwhile he was knocking the door repeatedly and he called my mother and inquired about my father's health which he used to blackmail me so that I should not inform anybody about him. He started asking me sorry in such a way that I felt he is ordering me to forgive him. When I did not respond for his requests, he stopped talking to me. Two days after, I informed my husband about his misconduct. My husband confronted him and he accepted few of his mistakes. He promised to treat me as his own daughter then on. But I and my husband were not ready to forgive him. My husband suggested me to file a complaint in Police Station for which I refused thinking that since his son has warned him, he will keep quiet. Couple of months after, he started harassing mentally. Whenever I am nearby him alone, he used to curse me indirectly on phone calls or giving examples of others to my MIL which indirectly applies to me. He tells the other person on call indirectly that I am third class, I have spoiled his house, no one is there in his family like me (which meant I am bad and destroyed his family), usually people will not get good daughter in law and those who get are lucky, your son will listen to you only till his marriage, after marriage he will behave like stranger and many other things. I informed my husband narrating a few instances of this. Even today he is continuing the same. Kindly suggest me if there is a way to solve this by coming to an agreement verbally or in written saying he will stop harassing me physically and mentally or a way to take action on him legally.