No ones fault but your problem to fix IMO. If it's your carrier and your freight account then you are responsible for it getting to the customer once he has paid for the order, trying to charge more after the fact has only seen you lose a customer (and possibly more). My honest feedback.
I would agree, I've had only successful orders from Luxire, and will continue to order because I like them. But nothing on the customer end is at fault in this situation, the error stems from the shipper, I would have expected luxire to eat all costs in this scenario, if not just to satisfy a potential long-term customer.