Wifi Modem not working

I am writing today to complain of the poor service I received from your company(8ta - Telkom mobile). I took out my contract with them, I am paying my account every month yet my WIFI modern is not working. I went to the branch in Cape Town CBD, they could not help me and referred me to their call center. I am most annoyed <br> with the fact that the branch could not assist or phone the call center on my behalf where as its the same company.<br> Nonetheless, I have been trying to phone the call center requesting for a call back but no one calls me back.<br> This is really frustrating as I am paying for a service that is not being rendered.