I understand your comment regarding the email, however, it's a Peruvian airline with a ticket flying from one Peruvian destination to another Peruvian destination. Other than a few tourists here and there, it's a safe bet that the ticket holder is going to speak Spanish. It's the same as expecting AA to send an email in Spanish on a purely domestic itinerary. Even with a flight like CRP-DFW or ELP-DFW I dont think that it would be expected. In any event, Avianca does the same and all correspondences are in Spanish. South America tourism is generally people from other South American countries and Spain. Obviously, Spanish isnt an issue. Then you have a few Europeans, many of whom speak a language similar to Spanish. Then you have a few Japanese, many of whom will speak neither Spanish or English but many will speak much more Spanish than English (read: mining). Then you have a few Americans and Brits. In the grand scheme of things, that's a pretty small number that the airline would be catering to. I agree that it is nice and that it probably should be done, but I am just saying that it is understandable that it is not done.

The problem with the ticket is a different matter and I believe you should send a note to Lan Chile in Renca and/or Lan Peru in Lima. Don't bother sending anything to the US offices.

Finally, I believe you should receive 500 miles for the segment on AA plus any applicable bonuses.