I would go with Signature instead. Maureen is right, your TA doesn't have control over this at all, it's the tour operator and the airline (which is usually chartered) that is making the changes...another TA would have the exact same problems unfortunately. My TA warned us about this when we booked last year in November for October of this year. I hope everything works out for you and that you won't have to deal with anymore hiccups along the way!!! It sucks that it's only a month before you leave for sure!