Possible ***** within Standard Bank

My wife has several Fixed Deposit or Access Investments with Standard Bank. Generally when these investments mature they are paid into my wife's Money Market Account. These are substantial investments ie over R100,000. However when these investments matured we were not informed. My wife unfortunately, because of COVID and other personal matters lost track of the investments.. In May of this year she went to the Standard Bank Midlands Mall to esquire about the investments. They could only find one which is still current but could not track the ones that had matured. We then emailed the ***** Department at Standard Bank and received no response at all. We then emailed them again on the 12/6 and obtained read receipts but again nothing has happened. These emails detailed exactly when the money was deposited and the details of the investments and the investment numbers. Whilst I am not saying that there is ***** committed by Standard Bank they must give a detailed explanation on exactly what happened to the investments that matured and why the money has not been paid into my wife's Money Market Account. At least one would expect some reply from Standard Bank, but to hear nothing from them at all is not acceptable. I admit that we should have kept better track of the investments but surely one expects a bank like Standard Bank to look after ones money and keep you advised of exactly where the money is. I realize that this is a serious accusation but we are talking about a large amount of money.