8 months of logging calls!!!

I have a standard uncapped 4mb DSL line which always operated intermittently at 4MB which is what i am paying for! i have logged several calls since last year with telkom and the issue has been identified to be a cable issue and that the cable needs to be replaced, i have logged over 20 calls trying to get this resolved however the calls just keep getting closed and marked as resolved with nothing being done, here are the call refs: (i only have call refs from this year) 1501crk240215 / 13crk230315 / 295crk060415 / 16crk150415 / 808crk150415 / 111crk100515 / 182crk080615 / 245crk170615 / 245crk170615.<br> What does a customer have to do? just keep calling and being bounced between the different call centers speaking to different managers, then suddenly receive an sms saying that the call has been resolved and closed as soon as it reaches the call time threshold! no wonder nobody will ever take telkom seriously.