Pathetic customer experience

I have a platinum credit card with FNB, I was informed that the platinum card allows a card holder access in to slow lounge at the airport. When I was flying on the rare occasion that I do I went to the slow lounge and was told that I don't qualify for access after swiping my card and that if I want to enter I must pay R250. I decided not to enter as that was not worth the 30 minutes I had to wait for my flight. When I arrived back home I find a charge for R250 on my card as if I entered the slow lounge. This is ***** and poor customer service from my bank and false advertising as far as I am concerned and now I must sit with the hassle of trying to get the charge reversed.