Never buy property from Vasavi builders, I have bought from them and suffering for last 6 years they have taken the money and never constructed the house and they are not giving any possession, they have taken this route and are prepared to handle any legal cases as they are spending money for lawyers and other things.
But do not do any construction progress. they will construct the house 50% and never give possession and make you run behind them while making false promises. beware and stay away, I would not recommend them.