Very unhappy with my customer care

My account is on hold for ***** which, there was no ***** on my account. They put my account on with no warning at all so I went to my nearest branch to find out that my account was put on hold. After which I had to call the ***** line where I was helped and was told that I needed to wait for a investigator to call me between 20-30 days. That was more than a month ago and still no call from any investigator. I recently went back to the branch to at least try and close my account to get hold of the funds since I have stuff to pay and want to spend my money that is in the account I pay for each month but can't even use. All that the person at the bank told me is that because of the ***** I have to wait for the investigator to call and explain after the person called ***** that day. The investigator still hasn't called and I am absolutely disappointed with FNB's service.