1. We booked the flat in 2013 for a office space of 1400 Sq,Ft.(Approx) 2.Kept paying all the installments diligently on due time till last payment. 3.The office space in the meanwhile was completely changed as per agreement and divided into 2 parts with a stair dividing the officve space. 4.When we started asking the buildere he kept giving excuses for years. 5. Recently we learned that he has sold the office space and registered to another customer. 6.Now he has sent us notice for non payment and that property will be sold to someone else.