Bayana paid by noatraised documents is valid or not for property

We have initially paid bayana amount through cheque for purchasing of a leasehold property and had made a notarized sale of agreement with the seller for sale of property. As owner was supposed get it freehold in four month. But now even the completion of four month he has not got the property freehold. So please can we can take any legal action against him. Our sale of agreement was notarized and was not registered