Unfair Business Practise

Hi.... How is it possible that you can close the savings accounts for my kids link to my account without a warning, notification or any indication that you will be doing it, the accounts was without money for one month and you decided to close it without notifying me, also when I opened these accounts I was informed that as soon as there is R100 in the accounts it will generate interest but it never happened. There was much more then R500 in each account.... Downgrade my account to a Gold Cheque Account holder immediately.. I think I should change to another bank.