From the contents of the so called agreement posted by you now it can be seen that this is not at all an agreement to sell the property. The contents mentioned are the conditions which the vendor is obliging to carry out.
There is no sale agreement at all.
There is no mention about sale consideration.
There is no mention about when the sale will take place .
There is no mention about the termination clause
There is no mention about acceptance of sale, k.e., buying and selling by both on the specified conditions.
There is no mention about the buyer's role in the sale agreement
The so called sale agreement is on Rs. 100 NJS paper and has no legal validity.
The said sale agreement can be called off without any notice or by giving a verbal notice and not beyond that.
You dont have to worry about such an absurd sale agreement, it is purely amateur and nothing serious about the property sale transaction hence can be ignored.