credit listing no one can explain to me

I've been paying my Ford credit vehicle finance on time, every month and all of a sudden I get a statement on 10 Jan 2023 showing an overdue amount. the 10 Dec 2022 statement showed an advance payment of R451.85 and I made another payment on 16 Dec 2022 for R10600. So how did I now get to be listed on credit bureaus, I've sent emails to Absa from Jan 2023, I've contacted ***, ***, *** but no one has been able to assist, all they do is transfer me from IVR to another, which when someone answers, they also transfer... My job is now at risk because of the listing and Absa not responding to my emails