I have called through after a long wait to speak to someone. The person that picked up the call (finally) greeted me in Portugese. Straight away, I explained that i don't speak Portugese and asked if I could speak to an English speaker. The guy then said that he speaks English which was great. I think that they all do speak English but will start the conversation or greeting naturally in Portugese. Anyway, the reason for my call was to see if I could change either dates or destination and whilst it could be done, it was going to cost me approximately AUD150 per person. I didn't take them up on it. I also tried my luck to change to another flight on my return journey at Changi check in counter and again they said that it would have costed us another AUD80 per person. Again, did not change the flight. The flight we booked and flew back was not full. I wonder why they wouldn't let us change flights even when it is not full.