I'm sorry to hear you are having issues with the addresses you are attempting to add to Quick Base. When you are using the new mapbox addressing is the issue that you aren't able to find the addresses in the search or is it that once you find the address and select it only the suburbs are showing up in the auto-fill?
While MapBox has strong coverage for the largest international markets, they do not yet have street data for South Africa. I've been informed that adding that capability is on their 2018 roadmap. Since this is a MapBox limitation, we would not be able to address the issue on the Quick Base side. Sorry about that!
I’m sorry, but i find this very disappointing since we were not informed of the planned change and I am paying a premium plan for a service that requires a fully functional addressing system. I find this very unfair