Car not removed from my name for more than 10 years

It recently came to my attention that a Landrover Defender owned by me during 2003 is still registered on my name even though it was sold on auction by ABSA during 2004/2005. I need urgent assistance to de-register this vehicle, because I cannot get the license disk for my current vehicle until this process is complete. ABSA is the proxy holder and therefore it cannot be de-registered at the licence office. I phoned ********** 340 opt 4 opt 2 there is no answer and also mailed ********** and ********** no response not even an automated response.