For those reading note the OP is in New Zealand. VW in New Zealand is owned by a private company with the rights to import VWs and use their name. Warranty is provided by this private company and then through VW in Germany. The warranty that remains is between the importer and the OP not VW in Germany.
We too do this in many regions, there are entire lines of Seat vehicles that are sold exclusively in certain countries with Revo software and full warranties. In those cases it is the importer who is handling the warranty not Seat/VW.
VW of America is owned wholely by VW in Germany and has not been authorized to allow for any specific brand as one that retains your full warranty.