FNBDeceasedEstate - Lack of accountability/customer service

My Dad has passed on 5 years now and we still cannot get any feedback /details on his share investments that should be paid out to my Mom. I have sent numerous emails and called several times since September 2023 to try and get this matter resolved. However every time "FNBdeceasedEstate " department informs me that they have a 24 to 48 hours response BUT No one ever comes back to provide and update. On 4 December Sheree confirmed that matter has been assigned to Sara-lee and she will respond to me, but nothing came of this. My last call was on 17 January and I spoke with Kyshik who informed me that he was escalating this matter as it is taking long. BUT still NO response 48 hours later.