I want to marry a girl but her parents are harassing us

Hi,I am 25 and he is 27. We are to convincing his family to agree for the marriage since 1.5 years. He is a Jain and me being Hindu.We are planning to get married in the next 3 months.However, i am going through major mental tension. His mother has called me very bad names including cursing my family. She has been harassing me by telling everyone in his family that i am already married to someone else and that i perform black magic on her son, so that nobody in the family support us. This has affected me mentally. I wish to file a complain just for her to get a warning,i have video recordings