Consumer Redressal

one of my cousin who is not a resident of jaipur purchased a flat in jaipur, of which full payment was made by a home loan but it was not given fully furnished at the time of payment. some days later, i along with my mother went to see the progress of the flat, but it was not in a proper condition, the tiles of the drawing room were coming out due to the internal leakage of water or so. we locked the flat with our lock and handed over the keys to the property dealer to fix the several problems and for its finishing. recently my mother visited the flat and found the lock left open and all the taps etc were missing from everywhere. on being asked it was replied that theft was committed in 4 flats, but the point is that the lock was not broken but instead it was left well open. moreover after so many months, it was not completely furnished and we were not able to make a use of our own property. kindly help out to redress the same.