RMB/FNB Card Division unable to correct system problems

We have experienced endless problems with FNB's card division. Credits cards are being blocked for potential ***** reasons, for transaction which have occurred regularly for years. We often receive no notification of this blocking activity, leading to embarrassment and inconvenience. SnapScan and Zapper transactions are no longer possible on several of our cards. The bank has had several attempts at fixing it, with no success. The issues have persisted since August. As RMB Private Bank customers, our communication went through that division and while very helpful, the issues have not been resolved. It appears that the RMB division has given up and stopped communicating with us.