Debit Order

I purchased a car through absa finance in late Feb 2015 and had an agreement that the first repayment will start on the 01 April 2015 and it did not the was money in my account up until the 6th I tried to call them on 1st & 2nd and I was on hold for a very long time when I did speak to someone I being sent from pillar to post, to my surprise I get an sms yesterday telling me to call the bank regarding my arrears that might have been due to a bank error, my question is if the bank had a bank error what does that have to do with me when I kept my end of the deal by making sure the are funds in my account now they want to mess up my credit record telling me I have arrears I will not pay any arrears I want them to fix it since its their mistake its not my problem they didn't run their script on time or whatever happened if the problem was on my side they should have told me not make their incompetence mine If this is not fixed I'm going to cancel the whole thing and go get finance elsewhere I'm really disappointed I really expected better from such a reputable institution.