Coscorp Master Builders

I have purchased number of new homes during my life time but never dealt with someone like Coscorp, who takes your money and then hides behind the warranty. We have had a leak in our home since day one, we had to threaten Coscorp with legal action in order to get it fixed. They came 7 times and the problem still exists. The poor design and workmanship is unbelieavable. Every unit in our complex have had a leak, some worse then others, some to the point where the owners were afraid that their entire ceiling was going to fall. The garage walls are so full of mold due to the water damage that we can predict that the garages will fall down one day and kill someone. Coscorp was called and advised that there is structural damage, but they just dismiss the complaints. What will it take for them to be responsible for their poor workmanship...a death of an owner. Master builder, my foot.