Horrible unusable service I pay a lot for

We have been paying for a 300gb, 20mbps internet package for almost three years now without ever even getting to 5mbps IF the internet is even working. I am honestly tired of trying to call Vodacom, spending hours to get through to try get their services in our area up and running again when it is down. I am honestly also tired of paying for a 20mbps wireless package that delivers less than 1mbps on average (I have quite a bit of speed tests to support this). I have been trying to find a Vodacom email address to escalate the complaint to although it seems there is none or just very difficult to find, as if they do not want to hear about it..