Credit score Affected

I've been a customer of Standard bank for years and I'm hoping this is the last fight. My account has been paid all the time on a specific day and is never late.<br> I've been monitoring my credit score very closely after being unemployed for almost a year to make sure my accounts are all paid on time and that I dont miss any of my accounts. I just received my recent copy of my credit report and it indicated that I am 30 days behind on my credit card payment.<br> The payment was made on the 28th January 2016 via EFT and last month 27th February 2016. <br> <br> I've been making great progress with my account and I never miss a payment, because of this information that was given to the credit bureau my credit score dropped by 31 points since last month. The account has one more payment left and this is how you guy treat me. I am guttered by this.<br> <br> I would like this issue sorted out with immediate effect or other avenues would need to be taken to resolve the issue.