Telecom New Zealand used Whole Brain Thinking to improve customer service and reduce repeat calls in their call centers. They trained call center agents to identify callers' thinking preferences and tailor their communication accordingly. This led to improved customer satisfaction scores and a 20% reduction in repeat calls in the first year. The program was then expanded across Telecom New Zealand and helped boost employee engagement as well. Initial results showed increases in sales conversions and reductions in repeat calls, indicating the success of the Whole Brain Thinking approach.