Un happy loyal telkom customer

I have had a Bad experience with telkom for the last month or two now, I have a telkom wifi line and router with telkom and it wifi coverage is low in terms of the signal.. when I called them to complain, they tried to help with refreshing the line and checking the signal and say on their side it's fine but I am still getting a low signal on my router and it some times cuts off when we are streaming and it's slow. So I opt for the cancelation of the service, which they are now giving me the run around.. if you visit any of the branches, the system is always down of offline.. every time I call to cancel.. the same result, system is down we can't assist you try again later. This is my airtime I am calling with, and it's getting wasted by telkom refusing or unwilling to help with a simple cancelation of a wifi line.. is this fair? Is it fair to pay for a service which u are not getting what u were promised? My money's worth.. pls help!!