Worst bank ever

I have never received such poor service from any bank I have been trying to update my details with them now for the last 2 months a simple change of cellphone number and email address but to-date I still have to be able to do so. Everytime I have to call them for updates then someone will call me back and then inwont hear back from until the next time I call again. Even just calling the call centre number is mission on its own I wish I never opened an account with them