FNB Incompetence!!

I opened two investment accounts with FNB in late January if not early February and decided to close them because the return in investment is not guaranteed. I decided to call the call centre to cancel the accounts to which one of the consultants confirmed that the account was closed. I called on another day to confirm whether the accounts were indeed closed and to my surprise the account was still open. I was asked to call a third time to confirm that the accounts were closed for good only to find out that they were still open. The lady I spoke to on my third attempt at closing the investment accounts advised me to allow the scheduled payment from my main accounts to the investment accounts to go through and then disinvest from there. I cannot do anything at this point because there is no money on the investment accounts until now!!! I can't do anything about this on the app or online banking system! My question is now where did my money go?? And why is fnb refusing to carry out a simple instruction?? I received an email with application forms for the investment accounts but I never completed the application forms so why did fnb take my money without my consent!! The call centre is useless because I was sent from pillar to post. No one is interested in assisting me. Worst of all my account had insufficient funds therefore I'm being charged for not being able to transfer money into accounts that I don't want!!! I want the account closed and all the transactions and charges reversed as soon as possible!! As a loyal fnb client I am so disappointed in the service that I have received in regard to this issue please assist urgently.