Agriculture land 10 cents adjacent to village to be mutated

Sir we are living in Visakhapatnam, Andhra Pradesh. our parents have procured 10 cents in the year of 1984 and have a valid sale deed without any linked document. In our sale deed vendor have mentioned that the property acquired by his own. Dispute : since 34 years, mutation not done on my name since we are unaware about mutation. however since 2016 we are sincerely trying to get mutation by the MRO. They said that our land kept on dispute category and mutation can not be done. In the village, villagers are trying to grab the money from us due to this problem. Seller is expired. Vendor son now askig money since he is minor/unaware about the property. in MRO office, no proof for dispute. Eventhough we are asking for the proof and name of the person, buy MRO is revealingn any cause but she is telling that we are not in possession on the land. hence she will not do any mutation. please guide us how to get MUTATION. Is MRO is correct to ask us for possession. No person is on our land. kindly guide us.