Called off marriage post enagegment

I got engaged in last December(2017), and after 3 months my marriage date is finalized this Dec(2018), post lot of melody drama from girl side like will do marriage post GST settlement in Feb ,2018 or girl planetary position not suitable it till November(2018). My would be in- laws told us they will spend 10-12 lakh for entire ceremony out of which 2.5 already spend on engagement. We never asked for dowry. After engagement they stopped talking to my parents ,only the girl was talking to me, suddenly her mother come to my house in March and asked my parents to conduct marriage on June, to which she deny considering hot summer may not suitable for guest etc. And that is how my marriage date is finalised to DEC-2018. We started calling her family to book the barat Ghar early but again they arrived late and the best barat ghar,s already booked. Looking at this my family asked them that now we will do all the arrangement. A common relative who is a intermediate [also my eldest cousin] asked for money before marriage around September –October month for marriage arrangement expense only. After this the girl starts complaining to me that my family is rude and greedy. It has been almost 5 months I am talking to girl, we do fight (I stay in small town in UP and they live in Ghaziabad). Now because of fights I call my real elder brother and told him entire episode. He called my would be mom in law several times in next few months and requested instead of discussing arrangement matters with the girl and boy she should talk to my parents. Her mom was rude and accused me for not trusting her etc and she has problem with me even started abusing my family that we are demanding money before marriage and within that heat argument her mother called off marriage on call to my brother and disconnected the call. Also in the same call why my brother asked her to talk about fights between me and the girl she only wanted to talk about money. Looking at the situation since starting we decide among us that there is no use of going forward with this, as we are worried that situation will become worse after marriage. Now after two days girl’s sister in law called cousin that they are sorry, and ready to pursue marriage and then told him that they even have call recording of latest conservation between my brother and her mother . We are really scared for them and now just wanted to get rid of this proposal anyhow. Now even I don’t what all they have recorded how they may present it to authorities. Can you please let me know what legal implications we can have are and how to get rid of them, we ready to give there gift and money.