Cheque bounce Litigation property

I purchased a property a couple of years ago with an advance payment of 15 lakhs. Balance is 20 lakhs. Only after making advance I got to know that the property is in litigation with government as it falls under Elephant corridor and the case is going on in Supreme Court for 10 years. The govt wants to take over the land. The court has prohibited sale or purchase of such lands falling in elephant corridor, hence no registration of the sale deed can be done. So the buyer said he can make a sale deed and get it attested by a notary so that is enough, I agreed and paid him. Also gave him two cheques 10 lakh rupee post dated cheques. But the court now really wants to acquire the land and not give compensation as the seller when he had bought the land had not obtained NOC from district collector. I refused to honour the cheque and now he is filing negotiable instrument act case on me. I only have possession of the land and original title and a notary sale deed to prove my ownership.