You have to read the catalog and sales documents for disclaimers. Have you called the auction house to see if it will reverse the sale? Try to find a lawyer who deals in art sales.
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Maybe all causes of actions that you stated, plead in the alternative. First consult with a local lawyer to see if a settlement can be reached instead of costly litigation. Bring along the bill of sale and catalog when consulting with your attorney.
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Demand that the purchase be rescinded or sue them for what you paid. One of my colleagues in my office handles these sorts of matters with galleries and auction houses, as do many people here on AVVO.
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