Refusal to withdraw money

I opened an account for my son. And have been transfering money into the account. I have just noticed that I can't take the money out of the account. I went to the branch and was assisted and the consultant called call centre . The call centre said 48hrs is their turn around time. Around 6pm I got sms to submit what I have completed at the branch. Clearly FNB wants to eat my money. I opened account in 2021. It's annoying not to access my money