You need to seek out a Real Estate Attorney. If there was knowledge of these items by the owner and the decided to not disclose them and play dumb, then there are repercussions. Here is the problem, it is not a Realtor or any other Licensed agent to discover these defects, our job is only to disclose what the owner tells us they know. the Seller in this case may have been very aware of the defects and decided to play coy, but that is the reason most contracts give you time for right to inspect, you need to find these problems up front and deal with them before time to close. Now you have let time go by, you need to have these professionals document the damages and defects, they must give their professional opinion as to how long these problems have existed, hopefully a Judge will decide in your favor. But you need a Real Estate Attorney and you need legal advice before you go any further!