Vehicle still under my name even tho I sold it to Kia 2 years ago

I sold my vehicle (grand i10) to Kia Fourways in June 2022. I have raised the issue in August 2022 that I was still receiving speeding fines for this car. Today when I went to renew my current car license at the post office, they refused to renew it, saying that I need to pay to renew my i10 first. I said I sold that car 2 years ago, and they refused to even renew my current vehicle license. I am now sitting without a valid license on my current vehicle because of this vehicle which I sold to Kia Fourways 2 years ago.