I wish to change route as ...HKG-Colombo-BKK-HKG.. instead of ...HKG-BKK-Colombo-HKG... However, CX CS told me to pay $75 for reissue the ticket and dun't waive such charge. According to CX's schedule, there is a flight ex. HKG to Colombo via BKK. What do u guys think?