Chances are also good (very close to 100%) that an Internet entity based in Mexico is not going to"buy" your timeshare, but is instead going to extract money from you while merely stringing you along and having you believe they are going to buy your timeshare.
Wait for it; a requirement for you to pay transfer fees in advance, tortilla tax, escrow charge, or some other such nonsense before you can "proceed". In the end, all that will ever ultimately "proceed" if youi go down this road is money "proceeding" out of your pocket and into theirs.
Save yourself the aggravation, disappointment and theft by not even going there.