Messing up my account! Unprofessional Conduct!

I have been paying my account via EFT every month and so for two months, my account was suspended due to bounced back debit orders. I called in advised them that I do not pay via DEBIT ORDER and that no debit orders went off my ABSA bank account from them. At this stage, my account was in arrears of +R400. So back and forth with them the whole time and it turned out that the account on their records is a standard bank account. I never gave them a standard bank account and never authorized any debit orders. So tell me whose bank account details do you have and why are you negatively affecting my credit records.