split toilet tank

Upon arriving at our home we found that during our absence the toilet tank had spontaneously split open releasing a continuous flow of water as the tank tried to refill itself. This resulted in approximately $9,000 damages to our property and the posiibility of damages to two units on lower floors still to be determined. This was a classic case of a latent defect. American Standard refuses to even replace the damaged unit much less than to be responsible for the consequential damages. They are now avoiding responding to my requests for resolution.