Absa loan deduction FIASCO

I took a loan with Absa. I found out that they made a debit on the 25th of the month when I get paid on the 27th of the month. They could not make the change on the first installment however I called them to make the change for the second installment. On the 2nd installment they cancel the Debit on their side, informing me that I am in arears. This has a negative implication on my credit record. What surprises me is that the vehicle finance is deducted promptly by Absa. Now they are telling me to make a manual deposit. These people do not know how to manage their affairs. This is very exhausting for me. I cannot keep on being compromised by these people.