Poor service delivery

On the 22 April 2021 a Telkom sales rep called me to ask to change over from ADSL to Fiber. Everything was installed and my services was connected, or so I was made to believe, because to date I still have no internet connection. Its been over a month and after numerous calls and emails the problem still persist. I'm sitting with a WIFI router and Vuma box in my house that is there for show, I have no idea what to do now. Come month end then they want payment but I'm not receiving a service. They expect me to uphold our contract but they not doing the same from their side.