Wesbank Incorrect update on Credit record.

We are in the proses of buying a property, while we were applying for Bonds at different banks we were declined by FNB due to an "arrears" amount on my Husbands vehicle which is financed through Wesbank. This was updated on his credit record and his overall score dropped, the catch is.. The statement send out by Wesbank in August shows no arrears on it, and the amount debited from his bank to. We came into contact with someone from Wesbank's Motor Risk Management department which informed us this will only be updated accordingly within 15 business days because there’s no amount in arrears. Its takes one person to mess up a credit record but 15 business days to fix the problem???!!! We need a bond by 04/09 and that’s their customer service for you. Isn't all the information supposed to be the same as it’s the same bank??