Unhappy Client

I have a vehicle loan with Absa and the debit date is the 10th of each month. The past few months it looks like there is a problem with the debit order. One month the debit order did not go through and there was enough money in the account. I decided to call and enquire why is the money still in my bank account and i was told that the debit order was rejected/not honored, which came as a shock because there was enough money in the account. I was told they will debit 12midnight of which they did. This month the same thing happened, i phoned Absa yesterday and ask the same question but there was no clear answer. I was told they will debit 12midnight of which it happened. My issue here is i dont want my credit score to be affected by something that is not my doing. I dont want to struggle when i want to apply for credit because of issues like this. Can you please fix this asap