Closing my account without notification!

I only learned on the 27th of May 2015, while trying to transact that FNB cheque my card was not working, and on further enquiry within the FNB's Carlswald branch, I was told that my account had been closed 'as I was not transacting enough'. Now, to add insult to injury- the consultants are saying i must re apply. What nonsense is that? Your inconsiderate actions have greatly inconvenienced me.