FNB - USELESS FOR HOW CAN WE HELP YOU

I received a message on my banking app, that i am in arrears. I have made payments to cover my arrears together with what was due. I have settled my arrears and I am up to date. I have called customer service twice and they are unable to tell me or point out where I am in arrears. I feel they have a **** customer service department, moreover they do not have no clue in what they are doing at FNB. I like to write to the CEO of FNB, maybe he will know how to reconcile my loan account.