Account not completely settled

I traded a Ford ecosport1.0 in Jan 2023 to a kia Seltos 1.6 2023. The Ecosport was settled in Jan and the sales agent who is not working there anymore even told me that the car has been settled as of Jan. A few months later I received a call from MFC saying that the account is in erreas. I'm not in kimberley .since Jan, have relocated to Bloem and we only speak via. I have asked and nobody is giving me feedback. All I know is that MFC wants me to make that payment...what is it that I need to me that payment if the car was settled