Welcome Mike, what you purchased is a vacation club. As resorts run out of traditional TS inventory, they can get around Mexican law and continue overselling by selling Vacation clubs, which is an option of a week or two at the home resort (Villa Group not city-specific) which they hope you do not use, and a membership in either, RCI, II or San Francisco, etc., where you get your discounted vacations. These discounted vacations that you saw in your presentation are last-calls and 1-90 day out distressed weeks that the rep magnifies into greater availability than actually exists. What you saw in the presentation book is screen shots in RCI format. BTW -you can gain access to similar availability from RCI or II for about $70/year w/o a long time commitment.
Since you are past your 5-day recision period (Mexican consumer law) your only option is to petition the Villa group with your discoveries, assuming you have now discovered that what you now own is nowhere near what was represented in terms of price and availability, and ask for the contract to be terminated and your down payment forfeited.
You would contact the VLO (the person you signed paperwork with) and contend the rep misrepresented the program (if they did) and you could only discover the misrepresentation once you had access to your account, way past the 5-day rescision period.
The VLO will say that nothing the rep says is part of the contract and only the written contract contains all rights and obligations. You will want to carefully review your contract to see if there is anything written that is not delivered on the website. This would be the basis for your request. You will notice the contract is in pigeon English as the original (and only binding contract) is in Spanish. Often the original Spanish language contract is purposely mistranslated into English to the developer's advantage. You might have to get a copy of the original PROFECO-filed Spanish language contract to prove misrepresentation.
Your odds of rescision and a refund are nearly zero. Your odds of terminating the agreement and losing your deposit are determined by the VLO's judgement, what you can prove and how much of a stink you can raise in a Profeco complaint etc.
Sorry for the bad news, but it's Mexico not the US or Canada. There are few consumer protection laws. There are no class actions and the courts seldom decide a case in a reasonable timeline but continue the case until all parties agree, give up or die. Our government also does not enforce basic international contract laws with Mexico so you are completely on your own.