Maybe it's time to start over. A real estate lawyer ought to be able to help you, but even an experienced Realtor should be able to give you good direction. Without knowing all the in's and out's of the issue, I would only suggest that you might withdraw from this contract, get your breath and reenter the contract with a broker on your side. Very few people actually buy something they have decided against. But there are lots of people who wish they hadn't bought a lemon. Buy in haste, repent at leisure.