Closure of Bank account

I left SA to look after my very sick daughter. My daughter passed away after 4 years. I decided to stay and requested Standard Bank to close my account. I am retired and not earning any pension in SA. The account has been dormant. SB sent me an email informing me that my account is closed after my sister who has POA went to see them. However, I notice bank charges added to my account on a monthly basis. There is no activity on this account other than their bank charges. When will they get the message that I live overseas and will not be able to POP into the bank to close the account.