charge interest when R0.00 balance to settle

<p>I used R3900 on my Credit Card with FNB, within 27 days I settled the credit I used. They charge me now R30.17 interest on my R0.00 balance. I do not recomend FNB credit cards!!!! They already charge you R30 account fee and R13 service fee just for having the card, but to charge Interest on R0.00 Balance, I would rather recomend any other bank since this is as bad as ****************. Just enough to boil my blood!</p>