I entered into a sale agreement with a party for selling out my flat in Pune, Maharashtra in a total consideration of Rs. 27 lacs. Party has given Rs. 5 lac as advance and registered the sale agreement and the balance payment scheduled within one month. Now 2.5 months crossed after the expiry of the time period. The party is not paying the balance amount and he is not co-operating for making a cancellation deal. Kindly advice how can I convince the registrar that the final payment is not made by the party and what is the lawful way to get the deal cancelled.