FNB Credit Card Division ***** and Poor Customer Service

I have been trying for weeks now to get a direct answer out of the FNB Premier Credit Card Division regarding interest being charged to my account. The first contact I spoke to advised me that I had been charged interest because, even though the bank had deducted the minimum amount for the month, I was still expected to settle the full amount. When I questioned it, she ended the conversation even though I did not say that I was done. Since then I have placed complaints via the FNB website and each time the same contact, Losper, avoids answering my questions. I would like to understand why the bank demands the monthly deduction as well as then requiring customers to pay the full amount due. Is this common practice? I've had several credit cards in my lifetime and have never heard of anything like it. Also, what's the point of paying Premier client account fees if staff think they can simply ignore you or treat you with disrespect. Is this service given to all FNB customers?

Absolutely disgusted!!!