terrible service and they are not keeping to their promises

The agent gave me a rate of 7.8% on my investment account and now they are ignoring me and not resolving my complaint. Owen Matidza from their complaints department listened to the call and tried to convince me to accept a less interest rate i refused and now he is not coming back to me as promised. I have been a client of FNB since my school days and if this is the way they treat me, i won't hesitate to say BYE as there is so many banks offering better service and valuing their customers. I have been calling for more than 4 days and everyday i get the same message Owen is still awaiting feedback and he will call you. I am really ****ed off with terrible service and i am going to move my business elsewhere.