STD Bank Service is poor

I have vehicle finance with STD Bank. It was brought to my attention that by some chance, I was one month behind on installments. So I spoke to a consultant in Feb 2022 and said that they can debit the outstanding amount from my bank account. This was done on 17 Feb 2022. Since then it has not reflected on my statement. I am constantly getting messages from STD Bank saying that I did not honour my payment commitment and that I am in arrears. I have sent all the documentation and bank statement to STD Bank as proof that it was deducted from my account only for them to keep on telling me that it has been escalated. I am sick and tired of receiving messages from STD bank and want this sorted out A.S.A.P.