Bad Bad service Tekom

I have an ADSL line. The speed should be 1 meg I have recently upgraded to a 2 meg line. My average speed is 25k. This has been going on now for more than 6 months. My service provider logs a call to Telkom. I get a call from Telkom asking what is the problem. I explain it to them and they say OK they will fix it. A day later I get an SMS saying fault rectified reply YES/ No. I reply No. When I follow up the call has been closed. I then complain again and the call gets escalated and the whole process is repeated. Is there really no one at Telkom that can fix the problem or are they just not interested. If you should pay even one day late they fine you. Surely we should be able to refuse to pay for this bad service. My newest ref No is 8ATK200215. I dont know if this call is even open. Please Telkom fix this problem. You advertise alll the wonderful specials on ADSL that you have rather fix the problems and word of mouth will advertise for you free of charge.