Uber drivers are becoming more and more dangerous and don't know the rules of the road

I am finding that the Uber driver's around Johannesburg are becoming worse and worse and more dangerous. We are finding that the driver's don't stop at red lights, cruise through stop signs like they don't exist, speed and drive recklessly, especially at night. Our driver last night cut in front of another car, and we nearly had an accident. We also had a driver who hooted and moaned at another driver for not using a traffic circle as a 4-way stop. He said the other driver didn't know the rules of the road, as traffic circles were regarded as 4-way stops - I had to correct him in teaching him that you have to give way to the cars on your right (he obviously didn't do his learners license if he didn't know that).