Collecting funds and they did not let you know

On the 29th November i received a sms to say thank you for my payment. I checked my daughters Capitec account which is in my name as she is only 6 years old and R350 was debited from the account. I called capitec which they advised I need to call African Bank. I called the bank and they told me that they can only log a complaint. When I asked how did they get my account details and when was this debit check agreed. The manager said that this was agreed on the 11th of November (no one contacted me on this day) and I asked how did they get my details they could not answer me. All they could say was I must was wait for about 3-4 days for this complaint to be looked at. The manager told me I need to send in a bank statement as well which I refuse to as they can see the funds was collected from an account I don't use and this account is for my daughter.