Poor Customer Service

I have fibre in my house and selected Vodacom as My ISP. Vodacom installed their Router in my house in May (SO***) but the service was only activated towards the end of August after phoning them almost two to three times a week requesting them to just activate the service because the Router has already being installed. The WIFI work very well in September with no problem but it started to give me problems in the middle of October, the WIFI was either unavailable or extremely slow. I reported the problem on the 26 October and they promised me hat they will send some one to come and have a look because the service was now totally unavailable but to date they did not send anyone to come and resolve the problem, i did not receive any communication to inform me about the progress of my request. What is frustrating is that, when I contact their call centre they just inform that the requested has been assign to the Guy called Thabo and they can do any thing about it. Every time when I call they say there is nothing they can do. My problem is that, I am currently paying for the service which I am not getting. Thanks Paul