Girl's family pressuring us after my brother rejected their marriage proposal

My family met a girl through the arranged marriage process for my brother. We met her only twice—once when my parents met her and her family, and the second time when my brother and I were present as well. However, my brother didn’t like her and decided to reject the proposal.

There was almost a month-long gap between these two meetings due to unforeseen events. During this time, my brother and the girl spoke on the phone maybe twice and exchanged only a few text messages. He was never interested in the proposal, but since my parents liked her, they wanted him to meet her once, which he did.

The girl’s family was informed about a week ago that we would not be proceeding with the proposal. As soon as they received the news, the girl and her father started calling us repeatedly. The girl wanted my brother to reconsider because she had become "attached" to him and wanted to marry him. However, my brother firmly told her that it wouldn’t be the right decision and that they couldn't move forward. It took her some time to accept the rejection, but eventually, she did.

The issue now is with her father. He hasn’t stopped calling my dad since they got the news. My dad doesn’t answer because he felt bad rejecting a "nice" family, but at the same time, he knows there’s no point in discussing it further, as my brother’s decision is final.

Today, we found out that the girl’s father had already informed the people in his "community" that his daughter was going to get married. Apparently, in their community, once a girl is introduced to a potential match, it means the arrangement is final. He also mentioned that his daughter has refused to consider any other matches and has threatened to commit suicide if she doesn’t marry my brother?? Wtf

I just want to know if they can file any legal case against us. Thank you