Lack of communication

On the 24th of April an internet card transaction of R461 went through my account and I disputed it via the FNB app immediately. I even stopped my card. I received no reference number nor any acknowledgement regarding the disputed transaction. I waited for 48 hrs and contacted FNb via app secure check and I was told to wait three days. It is now six days and still nothing. I need to know if there is someone looking into this or not