Incompetence and abuse

I have waited almost three weeks of August to receive my credit card settlement amount from Absa. Eventually when I received it, on the 20th of August 09:20, they quoted that I owed R7519.22 furthermore, I had 24 hours to pay. I made a payment on the same day, of R 7520.00 from Nedbank and sent through my proof of payment. They did not acknowledge my payment and two weeks later I ask for my settlement letter, I am told I owe R18-00.<br> This is ridiculous!! I feel abused and I will not stand for incompetence.<br> <br> What is the point of giving a time window? I demand my settlement letter as well as a letter of apology! I've had enough of rotten service.