Hire a lawyer to assert whatever rights you have under this "resale" contract and under the timeshare contract itself.
Many people have asked similar questions on Avvo, you may want to check out those answers. Like you, some have resorted to the industries that have cropped up to take even more advantage of these buyers, including "advocates" and "resellers," which seem to be nothing but throwing worse money after bad.
Disclaimer: Please note that this answer does not constitute legal advice, and should not be relied on, since each state has different laws, each situation is fact specific, and it is impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue. This answer does not create an attorney-client relationship.