Not quite true!
What they are saying is, because that particular model was not imported into Uruguay, they are not set up to service it. Their engineers have probably never been trained on that model as there were none in the country.
Quite understandable in my opinion. However, any real TV repair shop should be able to fix it. The MX7000 is not rocket science and uses of the shelf electronic components in the main.
The service manual is available to silver and gold members of this site.