Land dispute

Respected sir My family bought 1 and half bigha of land back then in the year 1998 from one of my dad relatives.Since we have less knowledge about the law at the time and being a close relative,we never gave a second thought of writing any agreement.However I'm sure if anything happens in future they w'd also agreed that we had paid money for the land. However it does not makes us less wrong though the land patta was under their name it was our duty to pay which we did not,infact we had a talk many years back to which even the owners also agreed that the payment will be made at the time of final settlement.Well we have approached the owners on several occasions for the partition of land but he will refuse us by saying that they will give us the land as soon as we plan to make a house. Sir that my house is already in Kiphire how are we supposed to transfer in Dimapur just like that and make a house,i supposed purchasing a land does not mean we should make a house by any means since most of the parents does that for their children and grandchildren. And just recently I had talk with the owner in absence of my dad for making an enquiry regarding the payment of patta but the reaction showed me assured me that he is not gonna give us land . We are also in position to ask the cash back with 15 % interest If they don't give us land. As a guardian of law you all are, I'm here with my sincere request for Some help in this issue. Thank you Anor sangtam Email [deleted]