We are two Wits engineers, and this is not theory. The instant-WhatsApp-response assistants we are describing are work we actually ship, they sit among the seven builds on our Work page, and we run them against the same test every time: does an enquiry that lands at 22:00 get answered, qualified and booked before the agent is back at their desk.
The pattern we see is consistent. For an estate agent, instant response is the highest-return first move we can make, ahead of listing copy or marketing, because it converts deals you are already losing rather than chasing new ones. WhatsApp is where those enquiries land in South Africa, so that is where we put the assistant.
We scope it to one measurable outcome and quote a fixed price in rand before any work starts, with no open-ended retainer, so you can judge it on the extra deals it wins. See how we build them in the WhatsApp chatbot guide.