My name is blockecked because discovery car insurance did not not deregister my name. When they said my car was write off. I went to traffic department. They said my insurance must do that (deregister my name. But they don't reply my email and my calls

Discovery insurance. Was my car insurance. Last year I got involved on a car accident. They said my car should be written off. And after that I was not aware they should deregister my name. This year when I went to buy another car. When they register the new car they found that my name was blocked. Because discovery did not deregister my name from the car of which they took(written off) we tried emailing Ntando and Thami the one who were in charge they did not come back to me of rep**** my email. Now I'm stuck my new cars disc I can't register it. Even standard Bank tried to call them they didn't come back to them