What should be done if a girl is forced into a marriage and wants a divorce?

assalamoaleykum… i m a muslim upper caste girl age 26, i was forced by a muslim boy who is of a lower caste to marry him.. he pressurized me,threatened me and one day at his home he arranged nikah,his 2 friends became witnesses and a first cousin of him(who is supposed to be my father’s step cousin also)became wakil…i unwillingly gave my consent in this nikah..for the past few days he was troubling me so i told my parents about it..i can’t continue this forced marriage, so i and my parents asked for divorce..my parents arranged a family meeting,called the boy and in front of every body discussed about the issue and than asked the boy for divorce,he said in front of everybody that he will signed the divorce paper…but later he refused saying that his mother doesn’t want and she won’t let this divorce happen..we are very much in trouble what to do now..is there any means from girls side to end this forced nikah,what are my rights regarding this..my whole life is at stake, please guide meand reply at the earliest…thank you”