Premier Client but NOT Premier Service

I am a Premier Client working abroad. I have tried on several occasions to contact my private banker via email and get no reply. I have tried to make use of the secure online chat via the app so that I can get my global account closed and I get no joy. Instead they continue to charge me for the privilege of having that account which I don’t use. I tried contacting our FNB employees whom I have dealt with before when they were in the same department - they respond by saying that they are no longer in that department and that I should contact my banker! If I was able to do that I would. My SA phone number only works in SA. They need to set up a call with me to resolve this.