Easy flyer at 10p a minute I would have no hesitation incalling the number, but at 65p a minute they are taking the micky. They know full well that the longer they keep you on the phone the more money they make to subsidise their "low cost" flight tickets.
Does this mean that you are not impressed by their fares? That they are not low enough for you? You could always fly with someone else surely? Maybe a full cost carrier....