poor service

I received money R400 and money got into my account on the 07/07/2020 and I got a transfer correction of the same amount of R400 a week later on the 13/07/2020. After that my account was on minus. I visited the bank and they told me that they have been having issues with their system and that the money went back to the sender. When I called the sender, she also went to the bank and found that the money did not return to her account and they even gave her a reference number: ***3. About a week and a half later I went to the nearest branch and they told me that they have no feedback for me. When I asked how they just said no feedback and when there is something they will contact the sender. It is almost a month since this happened and no one has contacted me or given me any feedback because I really need my money.