FNB no access account

I opened a tax free investment account for myself with FNB in 2018. I have been moving money back and forth in this account with now issues. A week or two ago I tried to withdraw from this account as I normally did but this time I received a pop up message saying that that the account is in a minors name and I do not have the authority to do so. I queried this on the app in the secure chats where I was informed that this account was put into my sons name and not mine. I tried to resolve it through the secure chats but the responses took forever and I do not have time to waste. I went to the bank where I found out they do not have the authority to assist. I was given a number to phone. The first time I phoned the lady told me that there is nothing they can do I must close that account and open a new account but then I can only put a certain amount in for the year... then the call got dropped on me and nobody contacted me back. The second time the lady told me that they cannot assist me the account is in my sons name and I must close it and put it into his day to day account. He does not have a FNB account as I moved him to Capitec because FNB does not offer own profiles to minors. She then told me that I will have to open a FNB account for him to do this. I opened 3 investment accounts for each of my children on my profile when they were small and then I opened an tax free account for myself but they put it in my sons name and now I have no access to my money and nobody at FNB has authority to assist. Nobody apologised for the mistake that has been made. I do not understand why I pay premium cost if I do not get any premium services. I phoned back again to ask if I could close the account and put it into his investment account but the call was dropped on me yet again without anyone contacting me back. I have this tax free account on my profile (which should have been in my name), my son is a minor and he cannot have his own profile with FNB, I do not have access to this account and obviously neither does he so who has access to this account?????? How can the bank have an account where nobody may access it... I need someone who can and would like to assist in resolving it because it seems like nobody can or even wants to help clients.