bad service

So Absa has a debit order system that sucks, they debited my account the 31st of July, on the bureau they updated that my account is in arrears for July, when I complained they said though they debit on the 31st they see the funds on the 02 of August,,, what nonsense is this? so I must have a bad credit record just because their system sucks, fellow South Africans, I hope your learning from this,,, As for me I will fight them until they fix my bureau