Congratulations,
mesaman! You are the first person I came across on a forum who asked for information BEFORE going to a presentation, not after when it might be too late. If you did not go to the presentation, good for you! If you did go but got away without signing a contract: even better! If you signed a contract, please read below, and ACT RIGHT AWAY!
First, but very briefly because I don't want to waste the time:
pittle was right in everything. He seems to be very knowledgeable. I can tell you a lot more about Mayan in Mazatlan because we were there already three times, the last time in December, 2008.
The Grupo Mayan runs the most aggressive, deceitful, fraudulent, and shameless time share sale operation imaginable. Their sales people are trained to mislead you, lie to you, intimidate you, coerce you, trick you into buying time shares from them in any imaginable way - and some which you can't even imagine! They will not let you go away, they will tire you out, until you give up and sign. (It is not really the first person who sits down with you, he/she does not know all the tricks, but the second, third, etc. who will join him/her if you balk or try to walk out at any time.) They will promise you the stars - almost all of which will be blatant lies. Note that on of the items they as you to initial on the sign-off sheet is that: "I have not received or relied on any promise , offer or inducement of any kind, oral or written not set forth in my contract." And the Contract, when you eventually will get only list that you bought e.g one registered and one vacation fair week at the level they were able to talk you into. And they are very careful to protect themselves legally.
Note that they will not let anyone else sit with you at the presentation, they will not let you keep any piece of paper on which they wrote anything, you will find that anything you wrote down will miraculously disappear, etc.
They told us that they do not sell GM anymore and duped us (how stupid can one get?) into buying their latest "invention", the Grand Bliss (which as of now only exists on paper and a model unit).
Now what can you do if you signed? They might have told you (as they told us too) that you can not get back the money you put down. This is also a lie. According to Mexican law you can cancel within five days - but it is not easy and you have to do everything what is required exactly. You can find information on
www.ripoffreport.com). If, by the time you are within the 5 days, you might try it. However, be prepared for rudeness, ridiculing, and no cooperation (obstacles, delays, etc.) from Mayan. There is not much you can do after five days. Good luck! Let us know what happened.