Standard bank worst bank to deal with !!!

Whom it may concern , We opened a bank account for our daughter when she was 1 years old by standard bank and deposited money into it from 2008 and this year when went to renew her card as we never renewed the card and they stopped /closed the account ... how can they we never requested it and there was money in , we never received a phone call or email ... the bank paid R700 over into her new account but were is all the intrest ? When my husband and daughter went to standard bank in bedfordview the person said to them it will take 7 days for all the intrest of 16 years will be paid over the following week , and my daughter still has not received nothing

Please answer these questions how do you close a bank account if there is money in and do not contact the customers ? I want my childs intrest asap as it is her savings how dare people do this to a customer ?!!!