Standard Bank Credit Card Service Bad to Worse

Standard Bank has blocked my Credit Card, stating that I am in arrears on payments. I have paid at least 25% extra on my instalments every month. They are also threatening me that my IT score has been affected.

Why? Because I have followed their app on the amount due and date due. They are now saying that they can see all my payments but I have been paying twice in the same payment cycle. Why have they waited until now to inform me this if this has been a problem for a few months already? Why does there app not stipulate then when you need to pay after date, rather than a pay before date.