Poor service and complete lack of customer service

I signed up with Crystal Web off the Vumatel fibre network. I chose an uncapped 100Mb line thinking that this would deliver great internet speed versus what I have had in the past. From day 1 this has been a nightmare. The speed is ridiculously slow on wi-fi which CW said would be due to interference in my small open plan house. Changing over to an Ethernet connection to me tv delivered better speed but shocking consistency. Despite the fluctuation speed it has been impossible to maintain a connection to watch something on Netflix from beginning to end. I have contacted CW and Vumatel to try and get assistance. I got an independent IT service to come in and look and they couldn't pick up anything obvious. They did pick up a much slower speed and recommended I downgrade to a 50 Mb line based on the lower speed. I have attempted this to no avail and have reached a point where I have requested details of my contract to cancel the entire contract. I have not been contacted. Clearly Vumatel and Crystal Web have grown so big that earning over R1000pm from me per month is more important than delivering a service that I would be quite happy to pay for. This is my first time posting something on Hellopeter but I have unfortunately reached a stage where I don't know what else to do.