Rating of Brands
I feel the only way to get them to really stop these malpractices is through lot of awarness creation so their business hurts. Otherwise they are not scared of Consumer Forums (many bribe judges/bureaucrats etc). If a builder's business goes down because 5000 people rated them terrible and 1M potential buyers came to know through local circles and then through other social networks by sharing this, consumer will win.
Just my views, hope everyone does his bit. more