Account paid in full but African bank will not close my account

I have been a client of African bank for years now and have been getting offers to settle my overdue account so final I take the offer of a 30% discount. I calculate the amount of my side and call the head office and request to confirm the amount and they give me a different amount, I then decide to go to the go the branch to be sure. I call the head office from the branch and get given a different amount and I asked if the agent was sure of the amount and she said yes and I advised I would be making the payment immediately. Payment was done only to be told they can not close my account because I didn't pay in full. A complaint was sent through to them and I was told they will listen to call recordings to confirm but I still get told I have not paid in full.