Frustrated wit FNB Premium credit card department, worst ever service in the banking system

FNB premium credit card division with no *** is maybe the worst bank division I ever have don business with. A Staff member whose name I will withheld for now, on last Thursday made a error on my credit cart and because of that my credit card is blocked and I need my money for petrol and crockeries. Its now almost 5 days and they send me from pillar to post ,there just no one to help me. I left messages to speak to a supervisor and no one seems to care. How do you get into contact with a supervisor or bank manager these days .They all hide behind there computers, faceless and if they don't know what to do they just put the phone down. The recording of my frustrated conversation with this employee 10 min ago is 682134 .Where this employee tell me the mistake on my credit cart was n system glitch. That for almost 5 days they cannot fix. Sies FNB your Premium credit department really the worst department in South Africa.