Unfair treatment and descrimination

I have at all times received a very unfair treatment/discriminated by FNB for the past eight years of being with the bank hoping that the service will change and as a results i had previously logged complains for two different branch managers, My recent unhappiness came after our (me & my wife) application for the housing finance and they approved it at a rate of up-to 12.54% hence the housing prime rate is sitting at 10.5 percent, When i inquire with them they tell me about our credit record of which i checked and ensured that it is clean and up-to date before we apply for the house. They are so used to robbing us with the extreme percentage as they did when we buy our cars in 2012, I even recruited my wife to join FNB from Absa thinking that they have a better service, I will definitely campaign their bad service and ************** in all forms of social media and community newspapers, newsletter etc. If need be we should consider changing the bank. (Cell: *** or ***)