Ceo should be fired

I recently settled my vehicle, got a settlement letter, even contacted the bank to sent my log book. Few days ago I received an email saying I owe the bank R4000. What utter nonsense is this. Bank takes 2mnts to reply to emails or never reply at all, what is the Ceo of this bank doing. I also work extra long hours from home,is this wonderful bank not checking why emails are not being answered to. I have been dealing with this bank for the past 20 so years, and to be treated like this, one thing is foresure I am not sending another to this bank.