House purchased in y1993 but no ownership of land on 7/12

Hi, I am staying in one of the village of Maharashtra. We have a house (built on the agriculture land) purchased from Person A in year 1993. Since then we are living in this house and also paying all the property tax (Ghar phala) and other Gram Panchayat related bills/dues every year. This also includes electricity or water bills. Few years back (may be 10yrs back) we understood the land on which house is built, belongs to other person say Person B. We had good relation with them and person B was always happy to sign for ownership transfer. But now when we wanted to do this, person B is not ready to transfer the ownership (on 7/12) due to land cost appreciation all these years and asking us to leave the house/land. We don't have any documents to show the ownership of land except purchase details having Rs100 stamp paper which was singed in year 1993 by us and person A (who is not a owner on 7/12 for that land). We have house on our name as per Gram Panchayat records and also all the bills and property tax paid on our name. What options we have now to get the ownership of the land on which house is built? Kindly advise and will the Kul Kayada applicable here for us to get the land ownership?