Credit Card still not closed!!!

My wife has been battling for months with FNB to close her credit card which she has NEVER used before. She kept on phoning FNB to close it & eventually on 24 Dec 2015 decided to go to the FNB branch in East Rand Mall to close it. She done everyting required to have it closed, but still to date, this account has not been closed yet and accumulating admin fees, but she has never used this card before. Why is FNB doing ********* business like this and charging for something that has never been used? Please rectify this ASAP! If this is not sorted out by Saturday, we are going to close the FNB cheque account and open it elsewhere