FNB revolving credit /private banking what a joke!

So I have been banking with FNB for the past 12 years, I am a private banking client along with bank charges and interest of +- R 1500 pm, but that seems to mean nothing at all and the service which comes along with private banking..... non existant!!!So I have a revolving credit facility which is now blocked due to an unpaid on my bank account, since when does my current account have anything to do with a revolving credit facility? I could understand if I have not paid my revolving credit facility it being blocked, but in actual fact I have never skipped a payment and did an extra payment of R 11 000 into the facility this month unaware that my facility has been blocked? So my biggest issue is should FNB not notify a client when they decide to block his accounts? 2nd issue , my private banker Mr Twala , I have asked him where in the terms and conditions does it state that your current account affects your revolving credit facility and to please organise my R 11 000 to be payed back to me as if I had known in the 1st place my facility was blocked I would have not made an EXTRA payment?? I have sent him 3 emails since Friday with no reply..Awesome service FNB...really not impressed!