Property

Dear Experts I have booked an under construction flat in Mulund in the year 2011. its a redevelopment project in which 14 floor tower will be for actual tenants and 21 floor tower is for sale. Till date 5 floors of tenant wing and 3 floors of sales wing are constructed in last 4 years. We ask builder about the progress and every time he gives us same answer that CC is awaiting. Its being 4 years now builder have not done anything and now he has introduced a financer who is asking a Rate of Rs 12500/- per sqft which is almost more than double. I have booked my flat in tenants wing on 5th floor and also done the registration of the said flat. please guide me what to do further.