FNB gave me incorrect/incomplete advice

FNB suggested I set up auto payment on my credit card. FNB neglected to tell me what the cost implications would be and I was incorrectly advised. I have sent FNB 3 emails in the past 3 days asking them to tend to the matter and I keep getting no response from them. I have rejected the auto payment on my app and yet I still get emails stating the opposite to what I want. FNB incorrectly advised me and now I am sitting with an unresponsive bank that does not want to rectify the matter I am not happy.