What is the ruling on a man who bought a piece of land, then it became clear that it was not the one agreed upon, and he wanted to void the sale and reclaim the price? Does the buyer get back the full price, and does he share with the seller the costs of notarization and the contract?

The general rule concerning the annulment of a contract and the return of the sold item due to a defect is that the cost of return falls upon the buyer, unless the seller was aware of the defect and concealed it, in which case the cost of return falls upon the seller. If the buyer has not taken possession of the land, it remains under the seller's guarantee, and the cost of return falls upon the seller.