Account Closed, no notification, money disappeared

I have 2 accounts for minors linked to my account. These accounts are for saving birthday and Christmas money received from family and friend. I wanted to teach my children the value of saving, so they do not use the money in the account. FNB, closed one of these account without notification. The consultant was unable to tell me what happened to the money in the account and I will hopefully receive further information via email. (This was the 5th consultant, and she was the only one that was able to provide some information. The other 4 were completely unable to tell me anything about the account) I then wanted to take the money out of the other account before it disappears, but I cannot. The account is inactive so I am unable to remove the money from it before FNB closed it too