No evidence of land purchased from him only except cheque payment

My father has bought land from neighbours in 2010 and full amount we had paid. Registry done in name of my father in Feb 2010 for 15 Marla land. Also in march 2010 brother of same neighbour offered us to sale adjoining 1.5 Marla land to us and we had paid 8000 in cash and 45000 through cheque to him in march 2010 and vendor on good faith assured us to transfer land title to us when land get register in his name. Now land is registered in his name but he is refusing to transfer title of 1.5 Marla in our name. We have no evidence of land purchased from him only except cheque payment but we had made boundry wall in whole 16.5 Marla in 2010 and we are cultivating crops and using land from 2010. Please suggest what we can do for transferring the title of 1.5 Marla land in our name. Please help