WRONG VIN = NO PARTS!! HYUNDAI PINETOWN SUCKS!!

I bought a Hyundai 120 in 2016 at Hyundai Pinetown and recently accidentally damaged my back light. I have been trying to find the part at various Hyundai dealers and they informed me that they cannot find my VIN number on the system. Hyundai Pinetown (parts department) itself cannot find my cars VIN number on the system as well. So I phoned the dealer and spoke to Luwelan, he assured me that this has been rectified. But it hasn't, because this morning when I tried to find the part again, I was told again that it does not exist!!!! This VIN number is on the licence disc, the finance contract, the maintenance plan and PARTS CANNOT PICK IT UP!!!??! The sales executive who assisted me is no longer with the dealer, Chantal (who was the manager of the sales executive who sold me the car) told me that THERE IS NOTHING SHE CAN DO!! What negligence!!! Is this what you call after sales service?? They dump you after they’ve sold you a car! Can a useful person please talk to me so I can be able to fix my car!!!!!