My account has an invalid branch

Good day,

I have been banking with FNB for years. The main branch that I opened my account with has been closed and I was never informed of such. Instead my account has been active for years suddenly when I want to apply for a temporary loan the call Centre supervisors inform that they cannot assist and sent to the branch. when I get to the east gate branch they told me to contact the call centre. I had to go back to the branch twice on different occasions. I had to fill in a form that would change the branch and it was sent to head office. The call centre supervisor informed that the branch has been changed to east gate and I need to go to the branch. I went to the branch yesterday; but the head office says they cannot change my invalid branch number on the account as they don't know who deals with the accounts that were initially opened from the FNB Maitland branch in Bloemfontein. Pumza at the east gate branch has tried to assist me in so many ways with her great service but its unfortunate that her colleagues are not coming to the party. I need assisted or at least an explanation in order for to know if I should close the account with FNB.