Apalling Telkom service

I made the fatal mistake of logging a fault for slow ADSL - 1 mbps on a 10 mbps line. The technician came a week later, examined my setup and said he had to fix it somewhere else and would phone me to check he had fixed it. No call, just an SMS saying the problem had been resolved. Yup, I don't have 1 mbps anymore, I have no internet at all! No point in trying the call centre of course....