Yes RACV was the original seller when it was first introduced, then a number of other major nation wide retailers started selling them. I purchased from JB-HiFi who also stock the range of SmartThings sensors Smart Home - Best Home Automation Devices At JB Hi-Fi
If you click on the link on that page to contact support it takes you to Email Technical Support | Samsung Australia
There’s nowhere to select SmartThings. The USA SmartThings said to submit the support query through the app and it would go to the relevant place for my location however they dont reply. I see a number of other posts regarding no support in Australia and RACV either not replying or not having the ability to do much for example https://community.smartthings.com/t/my-experience-with-racv-smartthings-in-australia-and-support-so-far