Failure of Change of ownership

We have been running around for the past few weeks my sister bought a car at Willam Hunt Pretoria, back in 1998 which was financed by McCathy she then paid off the car recently she sold the car, we come across a problem that she's unable to change the ownership because it has been registered under McCathy Finance, she gave them a call asking for assistance she was told to visit the dealership, she asked which dealership because it has been moved they didn't have answers, i mean this is a huge inconvenience because she's been going Back and forth