Agriculture Land sold on GPA

Hi, our family is 1 elder brother 2 i am and 3rd younger sister and all are above 18 and married now recently we have sold the agriculture which is came to our father by in heritance before the land sold father was death and the property transferred to mother by pouty and khata was in her name during the 2014 we have entered in to agreement of lad sale and the same was not signed by me in the agreement also the land was not sold due to some price considerations during 2018 we have made registered the land to the buyer now may question is as below. during the agreement for sale of land and registration of sale i was stayed out of India on work while doing the sale registration i have given POA to my elder brother to sign on behalf of me while registration the piece of land was retained by my elder brother to whom i have given POA without my knowledge and the share was also not distributed equally to each other the piece of land retained by him he got though resale from the buyer to his name by way of purchase now he is refusing to give the equal share in either the compensation or piece of Land i have given the POA to only sign the sale of land on behalf of me except this we have not made any MOU on shares or retaining the piece of Land. now how can i get settlement of Share which has to come me please give clear clarification how to proceed i am expecting your sincere response