Honeybee, sounds as if you really got stung. Sorry, couldn't resist.
My wife went through all 7-levels of dental Hell.
First, in Jalisco, to be a specialist requires a diplopia from an accredited college and it takes three (3) years. Then, the diploma is registered locally in Ajijic, at #4 Colon That is the Socio Activo de: Colegio Odontologico de la Ribera de Chapala.
If you have enough bone, you can get a regular implant, but if you need bone augmentation (graft), then that will add another 2-3 months to the procedure while the grafted bone blends in. During this time, you wear something temporary. You can also try a mini-implant.
Implants are an art, however one deficiency, IMO, in Mexico is that any dentist can do implants, but it could be your part of her OTJ "training."
The "Specialist" Ribera that my wife saw, wasn't even though she said she was. On her wall was a "certificate" for a three-day "seminar" on implantology. This is the study of implants, not training (the giveaway is the "ology".
Oh yes, if someone tells you they are a specialist and takes your money, and it turns out she isn't a specialist, that could well be fraud under the Jalisco penal code.
As for getting a refund; if it ain't in writing, it doesn't exist. And even if it is, and you don't get your $$ back, what are you going to do?
Your takeaway should be, do your due diligence before choosing.
Above IMO of course.