Thanks for the chance to help. I am an attorney with over 12 years experience. Hopefully I can help you with your legal question.
The contract is what is going to limit you.
If you have a contract, your obligated to the contract.
The best way to "get out of this" is to either
1. Sell the interest to someone else so you can pay off the debt
2. negotiate with the seller to cancel the contract...perhaps you can get them to take back your interest if you pay them...sometimes this is possible...but its up to the company to agree or not.
Short of that, you can stop paying...but it sounds like you may already be there...if you do, then understand the seller could sue you for breach of contract and take steps to garnish (take) your income or assets.
There is no "magic bullet" for these contracts...the timeshare
owners are having as hard a time as anyone in this down economy...they are struggling to keep alive...and will do what they can to force you to pay this contract. The best way to resolve is to negotiate with them to resolve.
You can consider bankruptcy as well...though that is a fairly extreme step to deal with a timeshare...it would remove the debt.