Happy New Year everyone! Please help!

I have issued a ticket from TPE-HKG-LAX-HKG-TPE on D class ticket from CX TPE. (I have a confirmed reservation for the 9th of Jan from TPE-HKG-LAX on D Class)

Late night on the 1st of Jan when TPE Reservation office was closed, I was searching online and found there was a seat available from HKG-LAX on the 5th of Jan (the day I need to go), so I made a booking through CX HK Reservations. When I made this booking, there were no seats available from TPE-HKG on D Class, so the agent just made the booking HKG-LAX with a seperate record locator.

Now (today) there are seats available on the 5th of January from TPE-HKG, but I'm having no luck getting CX HK Reservations to modify the HKG-LAX reservation to add the TPE-HKG flight, so that I can use that locator on my ticket.

Now I just need a way to marry the two segments, CX are somehow just not giving me any New Year love and are adamant that I can't do this..

Someone on FT must have a solution for this!! Please help!!