I'm a client with FNB for over 20 years

I'm a client with FNB for over 20 years. I'm trying to get my credit card cancelled but no one is able to assist me. I've just been on the phone with them, each consultant transferred me from one person to another but not one of them are able to assist me. I've made numerous calls to different numbers and each time I get transferred to another person who cannot assist me. Been on the phone for over 45 minutes and spoke with 9 different consultants with no joy. All I need is to cancel my credit card. How difficult is this for FNB to do. They don't even deserve a one star rating. Really frustrating 😡