By 50% of all bookings with LX/LH experiended the same! Sometimes the missing mileage shows up within 2 weeks, sometimes not. If not, you have to contact SEN hotline. Chances are good that they fix it while online, if not, you have to send at least a copy of BCs and the etix. Sometimes they insist that a copy is not sufficient, they need the original BC. Be sure to have some reciept that you have sent it. From there on it may take another 2 to 4 weeks more. Life is hard sometimes!