RMB Private Bank questionable service.

I contacted (30Sept'25) Firstrand RMB Private bank Sandton per advertised telephone number multiple times, no answer. I then tried the Menlyn branch. They answered. I wanted to verify an account number as part of my due diligence process as I had to pay a hefty sum (equal to a month's salary) to a company that holds an account with RMB Private Bank. The lady on the other end of the line was not prepared to help me cited privacy rules. In this day and age where emails are intercepted to change banking details, especially where big amounts are concerned, I would have expected a better service from a "Private Bank". It is further questionable that ABSA, a big bank, does not facilitate payments to RMB Private Bank nor feature their branch code. This little oversight made me even more nervous.