Firstly, you need to provide me some more details, but still I try to make a bit understand of it.
Secondly, if this is the ceiling land then go and approach the authority for the reason of it happening so.
Thirdly, then try to give the amount as penalty been charged on the said land.
Fourthly, and file the cases against the seller for concealment of the facts and get some amount from him as the settlement amount.