The hard-sell and tricks they use at Mayan Palace are well known here. Often people come on, having been tricked into buying Mayan Palaces with the usual timeshare salespeople lies, and the usual advice here is to rescind the purchase before it is too late.
If you really want to give getting a refund of your money back, you might contact PROFECO and see what they can do. If the timeshare does not advise you of your right to rescind, then you have longer to rescind with no penalty. It might not be seen the same way where they did advise you of your right to rescind, but did not advise you that you could do so with no penalty.