During a recent trip to our timeshare, we upgraded to a new addition that they were adding. After twelve days from signing the contract, we were contacted by the salesperson who we met with. He told us that the timeshare office made a mistake on our contract that we signed. They are going to need an additional $1433 USD to initiate the contract. Can they hold me to this mistake? In my mind, I already have a signed contract. We don't want to pay more and we don't want them to cancel what we have already agreed to. To dispute this we would have to work with a Mexican lawyer I believe.