IMPOSSIBLE to change the speed to 60km/h...Getting penalised on Vitality with DQ mapper

Discovery have changed the speed limit in our suburb to 20km/h. WHO drives 20km/h in a suburb? It was changed approx Aug and nearly IMPOSSIBLE to change the speed to 60km/h. There are NO, but NO speed limit signs in most South African suburbs but yet every single time I query it....Discovery asks me for a PHOTO of a speed limit sign with the "correct" speed limit?! Really? This error is causing us to loose a lot of rewards and cash-back etc. Surely Discovery can contact the Road agency to check and change. Streets in Randpark, JHB.