Horrible service from FNB for a premier banking client

Ever since I moved over to FNB in January I have had the worst experience ever!! I have a bank account at another bank with an overdraft - FNB confirmed they can only process an overdraft application after the bank account has been open for 3 months. I am waiting for the overdraft in order to close my account at the other bank. After the 3 months my salary has been deposited into the account I app**** for the overdraft because I am paying double banking fees. I am a premier banking client at FNB but I do not receive any service, and after struggling for a month to get the application in it was declined due to affordability. I requested that the bank provide me with a break down of what was used for the affordability - and the call agent confirmed she cannot. This is such bad service and I am regretting moving over to FNB