Payment Not Reflecting on Clientzone

I made a payment (1 Dec 2015) with my credit card on Client Zone and the payment went through (Afrihost even sent me a receipt and the money left my bank account). The payment did not reflect on Client Zone and so I contacted their support team. After them just telling me to make the payment again and me explaining I had made the payment they eventually checked that the payment was made, which they agreed it was. Themba then called me and told me that there was a problem with my credit card details on Client Zone. He then asked for my credit card details over the phone. I refused to give my details over the phone. He then said I should log on to Client Zone and re-add my credit card as a payment method which I then did. My account on Client Zone still shows that I am in arrears when I am not. After calling twice and emailing several times and going through the entire discussion about how I have made the payment, the person checking and then my Client Zone payment not reflecting I accepted that they knew I had made the payment. Today I then got an email requesting that I make a payment for December. This is now the payment I have already made. And received a receipt for.