Please clarify below scenario.
Sale Agreement made on total value of 750000/ ( Seven Lac fifty thousands ) and 50000/- ( only Fifty thousand ) paid as advance and mentioned the same in agreement.Within three months from the date of agreement remaining should be paid. But failed to pay remaining balance even after 6 months. Seller clearly mentioned in agreement that the sale agreement valid only three months.After 20 months from date of agreement Buyer filed civil suit asking for registration of property. Does it valid in eye of Indian Law.