If you are planning to sell your Timeshare please have in mind these tips:

Research. Search online to read what others have written about the selling company. Investigate to see if the company has a physical office, not just a mail drop address.
Never wire money. Wiring money for a business transaction or upfront fees should raise a red flag. It is the same as sending cash – it is not traceable or refundable.
Legal advice. As selling a timeshare is a legal property transaction, it may pay to get legal advice. Make sure you have all documentation in writing from the company.