***** department - no due diligence

I was ****** in Wonderpark Mall by the Checkers on 10 December 2019, I went to Checkers manager to ask for assistance as they had ****** my whole hand bag, cellphone, car keys, ID book and wallet, the Checkers manager refused to help me as I did not have a case number, the moment I realized she was not going to help me, me and my 5 year old started to run to the nearest ATM, the first one was next to Miladys, but unfortunately that one was off so I had to run to the branch that was on the opposite side of the mall, when I reached the Branch the door assistant helped me to stop my cards and call the ***** department, but in this period that it took me and my little girl to run to the branch to stop the cards they had hacked my phone and was in some way able to withdraw every cent in my account, the ***** department took one day to tell me that it was a pin withdrawal and they accused me of some way being negligent with my pin, but I am willing to do an affidavit to declare I never gave my pin to any person, It was not on a note in my hand bag or saved on my phone.

The ***** department assured me there will be a full investigation, but I never received a full investigation, when reporting the case to ***** I asked them over the phone to please tell me where the money was withdrawn maybe I can run there or we can get footage of the person who withdrew the money, but no nothing. Also, the maximum withdrawal amount was R3000, how where they able to withdraw R7750 from my account???

I want to understand how if I am not the person at the teller withdrawing the money, why is this not being treated as theft? And why did the ***** department not do a complete investigation. I want a full investigation and I want my money back.