Double charged

Again FNB has tried to cheat me. I had two business accounts with them and business being so slow my other business has not been generating any money, actually both of them. i received a letter dated 8/10/19 stating that one of my accounts will be closed and I was owing R737.03 which I find odd seeing as it was just about R400 a few days ago. Anyway I went to the branch to close my account and to my surprise I was charged OVER R1000, and I told the gentlemen that isn't fair because they just took full charges of R265 on the 5th of October hence I'm now owing just over R700, so now why on earth am I being charged another R265? why is FNB doing this to its customers when we are already battling? why am I being charged twice in one month? I want my money back. I was sitting in this branch for over an hour and eventually left, and the consultant was still busy on the phone trying to get this rectified because now the account is closed and FNB have debited my personal account. This is day light ******* and I am so sick of writing complaints about this bank.