Supersonic fixed lte bad service

Their customer service is absolutely *******, I have called them over 50 times and they just have me running in circles chasing my own tail. I ordered and received their uncapped lte deal for R999 and it has not worked properly since I received it. Myself and one technician eventually came to the conclusion that the problem is the signal, I was told that I need to speak to the finance department and order an aerial to boost the signal when I eventually got through to the finance department they told me that they don't do that, after many phone calls and no interest from them in fixing the problem I asked to speak to a manager and they told me he is busy and will call me back, they never get back to me on any issues. I have tried canceling the contract but I get no response on that either. I am not sure what else I can do about it they just don't seem to care about their customers.