Poor Service in Vehicle Finance Department

I have vehicle finance with Standard Bank, in 2022 my one debit order went of and came back, I was not aware of this, I also received no communication from Standard Bank that my account was in arrears, in June 2023 I was handed over due to the arrears, I then made 3x payments in less than two months to bring my account to date. I have send all the proof of payments to the lawyers as well as Standard Bank (to Standard Bank on numerous occasions) I have also phoned Standard Bank on various occasions as the one payment is not reflecting on my statement and I am receiving weekly emails/text messages that my account is in arrears and that I will be handed over/my credit will be reflected badly. I have in the last two months spoken to more than 6 different persons at Standard Bank Vehicle Finance Department to get this cleared out, every time they request that I send the proof of payments and that my account will be rectified within 5 to 7 working days, when I phone back to ensure that my account has been rectified I am once again asked to send the proof of payments. I have been battling since October 2023 to get my account rectified. I am at my wits end with Standard Bank now as it seems that no one is doing their job correctly, I am beyond frustrated as this is reflecting poorly on me and I have done everything possible to get my arrears rectified as I have made the payments. How can I get this resolved as sending emails and phoning Standard Bank is clearly not helping.