FNB Slow Lounge.

First time using slow lounge, I used the slow lounge for me and my friend last week Tuesday (04-06-2019) while waiting for our flight to Zanzibar. To my surprise upon return I am charged R800 (R400 each)for both of us and I have 8 complimentary visits. When I call they tell me that I was suppose to use the domestic slow lounge but no one explained to me at the reception and I didn't know this otherwise I could have not used it or rather go to the right place. why would I pay R400 for breakfast? I think FNB must make it clear in this instant and maybe decline the card so that questions can be asked before processing. This is a reap off