Private Bank Service is a disgrace

Standard Bank made mistake linking my Access Finance account. Hence I did not get my interest credits on my positive balance. Once I have discovered it, it was reported and it took Standard Bank around a week to do the interest calculation and to refund the missing interest. This service was acceptable. The problem is that the calculation that was done was not correct. It is now over a month that Standard Private Bank could not find a person within their employment that is capable of understanding basic interest calculations and understanding the concept of compounded interest. Although I communicate with the relevant people, no results could be produced nor have they been able to put me into contact with a person who can do an interest calculation. It find this an unacceptable service for a private client. I have no other choice to report his on Hello Peter.