Poor customer service and absurd bank charges no explanation except for you have to pay the bank fees

I have had chats with agents through my FNB app the past few days, none who gave me the correct information or assisted in resolving my issue. I had one unpaid debit order which I was not aware that FNB honors when you do not have the funds available as my agreement with the service provider was not for the amount they attempted to debit and I have already disputed with them directly. I have settled my account as advised and told that I could transact on my account, to my surprise there was a further R692 debited after depositing. You have taken my money for my debit orders which I specifically contacted you before doing so. All I am being told now that it is bank fees and they **** to me when I contacted about this just to get me off the chat. I pay my fees and manage my account well, this is the first time since opening my account that I have unpaid debit orders on my account and this is how you treat a loyal customer. If anything, I would not want to remain a loyal customer. I have been disconnected off chats several times during this nightmare.