I have gone through notary agreement for purchase of house by paying an advance to bank as the house was mortgaged and I paid the entire due to the bank directly by cheque as mentioned in the agreement.and it was also mentioned in the agreement to buy within 90days. But now 6months is going to be over on 23rd June 2012. And still the owner is not wanting to sell the house .what should I do .till how many days will the notary agreement be valid.