Worst Service from Vodacom

They closed my ticket, but didnt fix the problem. When we called the hotline, a consultant (very rude and spoke over us) explained to us that it is not their fault, that we are having connectivity problems as we are having on our plot to many extenders. I tried to explain that my computer is with cable connected to the Vodacom Router but there is nothing coming in. How can the Wifi extender be the problem when nothing is coming in?? This problem is now for weeks and Vodacom doesnt care to fix it. They say that they will allocate a technician but no-body contacted us. They close a ticket, where the problem is not resolved and than they are done.