Nedbank card *****

I am really traumatized with the ***** that happen to me on the 24th of June 2019 at around 18:52. whilst i was at home i got a message made from my bank card. I called the call centre immediately and while i was waiting for the call to be answered 2 more transactions notifications came through. By the time the call was answered another notification came through again and a total of R48500 was deducted within 4 minutes. the guy from the ***** call centre said they need 21 days to investigate and this is really pain to me. I had reserved that money for month end stop order. How can i wait for 21 days when i have financial commitments to fulfill. This is really pathetic. How did this happened when i had all my banking cards with me. I trust the bank to keep my money safe thus why i pay so much banking fees.