Don't want sell my property to buyer because he did byana to gain time and through that gain money

I am German citizen and senior citizen.I made byana agreement in Feb.2019 with 3 months given time but buyer extended two times the given time and asked me to provide irrelevant documents I shown him allotment letter possession letter and convince deed which was required to execute the deed on his name but he demanded some extra documents just one week before the registry date. I wrote him a notice that according to registrar on those documents are enough to do registry which shown to you but he replied Yes but my advocate tell that he need other documents like no dues certificate of farmers who sold land to chandigarh Housing board before 20 years,no objection certificate from housing board in which it should be mentioned that they got clearence from wildlife century to build houses. No body provides such documents and chandigarh housing board build these houses before 25 years. Be ause the agreement of sell was not register with my sign in notary register I went to court as he put case against me and ask court to give order to to execute the deed. But I gave answer to court that this agreement is null and void because this agreement is not registered any where for example he is showing that this agreement is signed by notary but I was not present before notary and not signed in his register,with this reason my advocate failed to get justice for me. And he didn't give other relevant points to court like Agreement We raised only one issue in the lower court that the agreement should be declared null and void because the payments made by buyer were not as per the agreement. We did not mention that this agreement was not made as per the Indian laws because at the time of notarization, both the seller and the buyer have to sign in the notary register and the witnesses according to law ,who are there also have to sign in the notary register, but here the seller has not signed in any notary register. Agrement is made without his name entry in notary register.This also raises a question mark on this agreement to sell. Secondly, this deal is made just harras seller who is a German citizen and also a senior citizen . It was a conspiracy to earn money by increasing the time period because a year ago the rate of the same property which was Rs 2 crores was Rs 80 lakhs which decreased with on few months to Rs 1.70 crores due to the recession and this buyer and property dealer Gulati thought that there would be 100% profit. And the same happened because the rates the same property increased to Rs 2.2 crores in three months after agreement. When this illegal agreement was extended, it was written that both are mutually extended the first agreement that the the buyer also need some time to arrange money because he got loan approval after few months after this extention means also could not able to do registry then why did the session court not consider this and gave buyer advantages..please help and provide me points to go high court.