Sounds like, from other information floating arround, that EchoStar is working on a new "Mexico" service that is entirely separate from Dish Network.
Likely you'll be forced to switch to that service when it finally goes live. Have no information on when or how much that will likely be. I don't think Dish Network has licenses for 110 and 119 to broadcast into Mexico, so I doubt they'll do anything to correct that problem. Likely they also be working on fine tuning the other footprints to attenuate service into Mexico as well, except for the SAT they have licensing for.