FNB POOR SERVICE

I'm so frustrated and disappointed by FNB, I called them about 2 months ago telling them that i've changed banks and need them to deduct my credit card payments from a new bank account as i switched banks because of their poor service and ridiculous bank charges. I was told the changes were made there and then while i was on the phone with the consultant only to find, a week ago they didn't make the changes on the system and are asking me to deposit money into my credit card, i made a call again this morning 25/07/2019 and now they are telling me to go to the branch to ask for those changes to be made. This is absolutely absurd and unacceptable. FNB is messing up with my credit score and this i will not stand for.