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It does sound as though he was rather vague about his requirements, so the TA is not entirely to blame ''
How can saying when they wanted to go and telling them they would be travelling under an ESTA be considered vague? It's not like they walked out after 2 minutes, they were in there for over an hour discussing departure dates, I don't find it too much of a stretch of the imagination that a trained TA would know they would need to come back with in 30 days, do you?
Anyway, I have spoken to the US Embassy and they have confirmed that changing the flight is the only option so I'm off to do battle in a bit.
Lisa x