Incorrect Service Fee

I changed my account from a Prestige Account to an Gold Elite Account in April, through my private banker at the time Martha Zondi who was based at the Brammfontain Branch, through many emails of correspondence this was supposedly been done, since April i have been charged an incorrect service fee, varing in amounts every single month, every month i have to phone, speak to some random person, have the fees reversed, assured that this won't happen again, or its a system error or numerous excuses and at the end of each month, again i get an incorrect fee, but on the system i'm assured its correct, what is going on with systems and customer service, I have been a loyal customer of Standard Bank for over 20 years. Martha has not returned any of my calls, i have a ton of reference numbers, various people phone me to assure me its been sorted out, others tell me i have to go into a branch... I am just so sick of the pathetic cutomer service of the bank.