Poor customer relations

I have had 3 personal bankers in less than 2 years. Most recently, I was assigned a personal banker without even a notification about it. I complained to Investec about this and received no reply. You cannot form a relationship with your personal banker if they change every 6 months, this is ridiculous! And Investec handles complaints by ignoring them. I am very disappointed, especially considering the premium that I am paying for having an account with them.