Where do you live? If not in Brazil, can't imagine those few Gol miles doing you any good, but Delta's minimums for free flights are also pretty bad. If you think dealing with Delta Sky Miles by phone can be difficult, try it with Gol or TAM. Call Delta directly regarding having any Gol miles credited. They may ask for a copy of the boarding pass, but if you have the confirmation #, maybe not. I have 25k with Delta, and doubt I'll ever use them except maybe for a short domestic flight (recently I used 25k on United to fly first class across the country).

For TAM, if you're in the U.S., maybe try phoning their U.S. offices regarding the special you found. http://www.tam.com.br/b2c/vgn/v/inde...000b61990aRCRD

Avianca Brasil is sort of on its own right now. formerly Ocean Air, it's operating separately from Avianca International (which is in Star Alliance now), though presumably will move to the Star Alliance should TAM move from Star to Oneworld as a result of its merger with LAN. My wife flew on them when they were Ocean Air and liked them, but it doesn't surprise me their site isn't oriented towards international bookings.

In Brazil, my wife booked a domestic Webjet flight for her nephew using Decolar, and discovered she'd erred in his name, and Decolar said she'd have to pay more than the price of another ticket to change (Webjet said they wouldn't have charged but it was up to Decolar). She bought a second ticket, directly through the airline. I've not used them so can't vouch one way or another.