Contract declined

I have an existing contract with Vodacom. I wanted to add a new line and was told it was declined because I have a legal dispute with them for an account I had with them in 2008. After trying to get hold of their legal department with the consultant at Clearwater mall for hours, a guy answers and says I don't owe Vodacom anything and he'll put up the necessary note. It's been a week now and I have received no help. If my name was or is at their legal department how in the world did they approve the line I have currently which I opened last year??