How to file defamation case against a party who broke my engagement & defaming my status?

I have got engaged to a girl in November 2020. I wasn't in that much in contact with girl & her family after the engagement and never made much of phone call. Now girl side family cancelled the engagement and the reason they give me is that i wasn't talking to the girl over the phone & based on that they have assumed that I don't bear love for the girl & I was marrying with force from my family. This caused loss of reputation of my family as they live in a village where reputation, social status is very much important. My father was a school teacher due to which it caused more damage to my family. This is all because i simply didn't have conversation with girl over the phone. They unnecessarily defamed me & my family to simply cancel the engagement. Now It will affect tremendously for me & further to my little brothers future. I don't want to force the girl side family to change their decision about the cancellation but i would like to pay them for what they did to us. In this case, if I wanna file a defamation case, how can I proceed. Any advice or suggestion would be much appreciated.