WORST SERVICE EVER!!!

I am an FNB client. I have a personal cheque, saving and business account with FNB. Our business has had some though times the last three months. But now today FNB has magically WITHOUT any notification closed my cheque and savings account. THEY JUST DISAPEARED!!! Apparently FNB is only a partner when times are good. NO EXPLAINATION!!! NO NOTIFICATION!!! And best of all no one in the call centre can help me because the accounts don't exist!!! And magically anyone else is not available. HOW THE HELL DOES FNB DO BUSINESS!!! *****!!!