Standard Bank

Lets see if this will work. I have an Prestige account with Standard Bank now for a few years. I had a Will drawn up a few years ago and I have lost my wife and daughter in a car accident. Because Standard Bank was keeping the will they were appointed as the executor. After all was finalized, which took almost 2 years I must add, I have found out that there are policies that can pay out. For the last 3 years or so I have asked on numerous occasions to get a letter from the bank to give me permission to be the executor or the send me a power of attorney letter, but I keep on hitting a brick wall. Excuses I get is that the person resigns, they will request the file from the archive and will call me back, then I call with no feedback, log a call with customer service and not even they can get hold of the department in Rosebank. I have left so many messages, e-mails for the manager that he did not even call me back. Who can assist me in this regard because I found it very annoying that you want business but cannot deliver.