Can't trust them

Bought a new home from them only to get a leaky bathroom 6 years later. Turns out they installed the wrong type of tile and installed them incorrectly. When this was pointed out to them they refused to do anything about it. By this time mold, rot, and a $20,000 restructuring/retiling of the bathroom resulted. They insist their work was appropriate. However the tile was porous and not intended for use in a shower. Other than a few other more minor issues we are happy with the house, it's just a shame they refuse to do the right thing. (By the way, the 2-5-10 warranty will only cover water damage in a shower if the house is LESS than one year old! What a joke.)