Never answer phone calls

I asked standard bank to close my old access savings account as the gave me a prestige cheque account . After transferring all my money to the new account i asked my personal banker Miss Nkosi to make sure to change all my debit orders to the new account . After traveling out of the country a noticed none of my debit orders went off . I tried phoning my personal banker and left emails but nothing ! No reply ! Please can someone contact me from standard bank via my email as im am not always in a area where i can phone