Unilateral mistake (a mistake by one party) is a potential defense to a suit for breach of contract. Was it a mistake? Or, were you tricked? I don't know. If you close you will waive your complaint of breach of contract. Do you want to get out of the closing? Go consult with an experienced real estate lawyer. You will not solve this problem on this website.
DISCLAIMER: This is not specific legal advice and does not establish an attorney/client relationship.