Lost money from Standard bank account

I have fixed my money for one year at Standard bank last year in May 2022. The money was going to be ready or mature this year in May. When I go to the bank to withdraw my money I was then told that the money has been withdrawn last year on the 29th of July 2022. The matter has been reported to the bank but they failed to trace the perpetrator. The branch manager was the one investigating the matter but they failed to trace. He even said the way this has happened it's an inside job. The sad part is, that was the last cent that I had after my father's death, it was my inheritance. I kept the money to pay for my study fees. Now I can not go back to school because my mother is unemployed.