Blocked

Good day I am in need of major assistance My FNB credit and cheque cards were blocked for international purchases and I was not even notified before this approach was taken I have called in to FNB who sent through some documents to fill out and email back which I have done, only to be be told it is not their department who has put a block but rather the forex department. I cannot get through to them even though they say trading hours is until 13:00pm and when I phoned through around 12PM, an automated message said they have closed early and cuts the call Please can I get some assistance in order to resolve this, as my Netflix payment keeps bouncing as they cannot get funds due to the block