Wrong survey number in purchase deed

Hi, I have a property in Maharashtra. My grandfather had purchased this property from a women in 1947. After few years that women expired and before that she made a gift deed of some of her property to her long relative in 1964. The plot which was bought by my grandfather had only one survey no at the time it was bought but now in survey records it actually consist of three survey numbers. We already where having house and some plantation on the plot which was bought and we constructed a new house 6 years back by demolishing the old house on that plot. Now that long relative of that women from whom we purchased the land is now saying that it is his survey no and have asked us to demolish the house. As per survey records he is holding correct survey number. But we are holding this property since 1947.Also all the boundaries mentioned in our purchase deed are correct.Women also mentioned survey no will be corrected if wrongly entered. All the people staying besides us know us right from 1947. Please need help on this front. Thanks