MISSING MONEY PLEASE HELP

On the 3rd of July, while a home I received In- Contact messages on my banking app that R1550 was taken from my account by home trade. While I was getting ready to go to the Bank I received another in - contact message that another R4960 was taken from my account by the same home trade. I immediately drove to the Springbok FNB Branch. I got there and they put me on a call with the ***** Department, who then collected all the details and said I should receive a case reference number within 48 hours. I might just add that I am a new FNB customer and I have no FNB card. This is the 2nd time my salary was paid into FNB and have only utilized the app to make transfers to my Capitec account. I have since not received a case reference number and have been to the Branch in Springbok 4 times already. My hard earned cash is gone! I am stuck and need urgent help. I have never had an FNB Card to even begin with. What do I do!!!