False case of dowry before marriage

Hi, We are in a deep dilemma here without even doing anything, here is the case: we met a family through one of the matrimony sites and after talking to them we went ahead and scheduled a meeting with them to check if everything was compatible with the family and our kids. After first meeting with the girl's parents and the girl, everything seems reasonable but we have given our kids the time to get to know each other before deciding to marry each other. after a few days both the kids agreed to marriage and we have decided to proceed with the ceremonies as per Hindu culture. 1. roka happened when everything went smoothly in that ceremony. but after 2 days as our kids were chatting over the video call a certain thing just came out of girl's mouth which was" How will you prove in court that you have not taken any dowry from us " followed by many other mean stuff out of nowhere. we have never expected someone to say something like this as this was a complete lie, we have never asked for a single thing. this was started by a common argument between our kids. 2. After this had happened and a proper family discussion we decided to call off the wedding which was 4 days after the roka, so the marriage never took place only the roka took place. We have given the girl considering she will a daughter in our family certain gifts which is a common practice in Hindu culture, also we are the ones paid for almost everything wedding-related with a nearly 70/30 ratio. 3. Now the time was passing by we were still struggling with the financial loss suffered, after 3 months they filed a fake case for dowry on our family. We have taken nothing from them as i mentioned we have paid for nearly everything and we have receipts for them. I ask for your guidance on this matter. What should be the correct course of action and what needs to be done thank you.