I used to get my RTW tickets from the local Qantas Travel office. When QF closed all those, I moved to a local travel agent (such as Flight Center) until the online tool was created. The first time I used the tool, I was able to book CBR-SYD (AA code), SYD-LAX (QF code), LAX-PDX (AS op/QF code).
Then I started getting DONE3s with a connecting DAS13. I got the DAS13 from the local agent, then I had to go elsewhere for the DONE3 (ex ICN or TYO).
The first couple of DONE3's, I used the online booking tool until they changed it to the now previous version.
After they broke the booking tool, I made use of the then still around "Canadian Exception" to the country of sale vs country of departure pricing rule and called the AA RTW desk to set it up, then emailed the agent in YYZ that had been posted about here to take over the ticket and issue.
Then I found the CX Japan contact details and had used them for 3 or 4 years.

Would have used the Japan office again for my 2016 trip had it not been for the baggage interline changes. They had also removed the country of sale vs country of departure pricing rule, so seeking a booking agent in the country of departure was no longer required.
Due to my trips having 2 main tickets (DAS13 and DONE3) and 2-7 sectors on side trips, I went to the local agent in the hopes of getting all the tickets in the same PNR (they were booked as such, then split into different PNRs when issued).

Depending on how the interline rule holds out (with CX going back to the old policy and QF quoted as reviewing the current situation), I may go back to booking via the CX office. email/text is easier then phone/office visit.