Engagement done but now not interested to marry

Hi , 4 Months back i went to my native and my i have done the engagement but later due to some job issues i asked girl family to extend the marriage date but after listen this they have tried to put pressure on my family and when i come to know this i have decided not to marry that girl as if they are not understanding my problem before marriage then after marriage they can't understand also. We have informed that whatever money you and we have spend(like marriage hall and food itmes) at the time of engagement will sit together and do it but they are not ready to do so they are keeping pushing pressure on us to do the marriage other wise will charge a fake case against us saying we have asked dowry due to that now we are cancelling the marriage but we never asked them as we knows it's a punisable offenece as per the government of india Even they don't have any proof but unncessary they are giving daily torture to us even though they have spread in my native that i have already married and have a small kid . Beacuse of all this cheap things they are doing now i don't have 1% chance to marry their daughter . So kindly help me if they put the case how i will pretend my self and my family even we knows they will put the fake case