What all consequences possible ?

Dear Sir/Madam, This is regarding the cancellation of engagement. Its about arrange marriage. I will explain details and I request you to please share your views about the same. I saw girl in the month of august in formal way as happens in arrange marriage. Within two days we informed her parents that boy liked girl. After that, as their place is far away from our place and all their relatives are from near to our place, we asked them to do marriage at our place. They agreed, We didnt asked for a penny of dowry. They said they will put some gold as per their wish to her. Then they stopped discussion with us for around 2 and half months. Finally as boys side took initiative and engagement date got fixed, we asked them if possible do it at our place. They said ok, then they didnt put their efforts in arranging a hall for engagement, not bothered about any formalities etc. They came one day before the engagement and paid the hall booking rate. We from boys side did all the arrangements for ceremony. It happened. After that, they didnt sat for the discussion about marriage date. After ceremony, boy spoke with girl on phone for a week, later on she started ignoring the boy. Without any reason, she blocked him on social networking sites. Then boy called the mediators and said, plz confirm whether you are willing to do marriage or not? Because after ignoring from girls side, then he did not contacted her. No physical relation happened, as they havent met after engagement. After this phone call, the mediator recorded it and showed everyone for listening. Then her parents came to our home and abused us, they tried to threat us after coming to our own house. Somehow they ran away from home when they tried to threat us, Now in this situation, What can be done? What all consequences are possible? They asking for the money settlement? What should we do about the recordings which they made? In all girls has not spoken about the issue with boy, is it advisable to speak them but as they lost all trust by recording the phone call, what should boy do? please guide. Thank you in advance.