legal notice should reply if not recieved by the person for

Hi all, My brother got engagement and later this engagement was broken by girl side bcoz they want to do marriage within 3-4 months. After some time they sent a legal notice in favour of my brother by the girl through lawyer. The notice recieved by my mother at home town and brother is not staying in home town.in that notice they are blaming we are asking this and and that and they spended money and given 51k which is completely wrong. Of course when a function is performed both the party spend even we also spended and went to there place with all family for engagement. The most important I have a call recording where girl father was telling to break this engagement. Please tell should we reply if yes who will reply since brother didn't recieved this.