Usually when I try to get higher speeds from Telmex Infinitum, the message was that I was getting the best possible speed already.
For the hell of it, I tried again today. The program let me in and I asked the the 50 Mbs package. In return I was allowed to sign up for a 20 Mbs package, which, if it works, is about 3x what I get know.
I even got a email from Telmex acknowledging the order.
We are at the very west of Ajijic, not far from the Jocotepec border. So we shall wait and see what happens.
I personally did not think Ajijic and environs would have sufficient support for more than one high speed service. Looks like I was wrong.
(It also looks like I will not need new lines etc. like I would have with Ilox.)