FNB charging me interest even though I am unable to transfer money into my credit card!

This is my third time posting about the same issue. I have been waiting for 3 weeks for my credit card to be downgraded from Premier to Gold, and more importantly I am also unable to transfer money into my credit card, so as much as I want to pay my outstanding balance I am unable to and yet FNB is happy to charge me interest on it! Every time I post or call about this issue all I am told is that it has been escalated. Do not call me again to tell me that you are investigating and will escalate my issue, if you cannot enable me to pay my account then just close it so I can be done with this incompetence! I moved over from Std bank to FNB 2 months ago and I regret it. Think twice before switching to FNB! Complaint reference numbers: ***NF, ***NF