各位好，我在OBB上订了从布达佩斯至布拉格的卧铺
原本班车时间是19:29-08:11
前几天发现OBB的订单显示如下警示：
Journey has Changed
There has been a change in the timetable which affects your scheduled
journey. Your ticket will remain valid. Please remember to find out about the
alternative trains or transports available to you during the time the ticket
is valid. If you have any questions, please contact Customer Service on +43 5
1717.
当下查了一下发现我订的那天确实班次被取消，系统上看不到，我写信至OBB未获回复
但隔了几天又查，发现我订的那天在MAV官网(匈牙利国铁)又有班次了
但时间改成17:29-08:11，我昨日也赶快在寄信问匈牙利国铁当然也是尚未回复
我现在的问题是，我该赶快先订MAV上有看到的班次然后到维也纳时去退OBB票
还是OBB原本的票就可以直接搭17:29-08:11这个新的班车时间?
不晓得有没有人有遇到这种情况?