Hello Stephan and Andrea,
Andrea´s suggestion is excellent. I know that there, in the private Chilean forum you can find some colleagues that do that kind of work.
I am from Spain and, like yourself, I have been living in Chile for the past few years. Sadly I don't know anybody working in the subtitling area, and I would like to because I studied cinema and tv as my bachelor degree. I recommend you contact tv and cinema producing companies,which is something you might have done already.
As far as I know, most of the translating bussiness for Latinamerica takes place in Mexico, Argentina, Venezuela and Miami but Chile Films (www.chilefilms.cl
) also works in this area.
Another alternative is to contact more local forums. Proz has a private forum for translators living in Chile (moderated by Claudia Iglesias - http://www.proz.com/profile/17379)
and a there is a yahoo group for chilean translators. Someone in those forums might have a better answer for you.