Fnb not taking thier customers serious

I frustrated and disappointed on how Fnb is handling the closure of my credit facility. I called Fnb on the 12/04/2024 requesting a settlement amount in order to close the facility, to my surprise after transfering the given amount, 3 days later I received a call from fnb to say I need to pay an extra amount in order for them to settle. I disputed the second amount because I was misinformed and now I have incurred unesserry cost on the same credit that I called to close. In attempting to dispute they told me there is no proof yet they said the calls are recorded. Mind you you I had to open 3 complains after informing them I am not happy. I was not taken serious, I was being transferred from one departments to another and they kept sending automated emails just to brush me off. Now the credit facility has accumulated even more charges because of they lack of care and ignorance. Yet the say "HOW CAN I HELP YOU".