Wesbank final payment

I have one final payment remaining on my vehicle. Wesbank is a punctual with their debits as the trains of Japan. But now, my settlement amount is less than their standard debit amount and guess what, no debit. Also when I go onto their account services and request a settlement quotation the message I get back is "A settlement quote is not available for your account." Furthermore, when I phone their help desk, I'm told the system is offline and my details are not visible to them. Wesbank, I'd like to settle my account before interest is allowed to accrue on my slightly lower than usual outstanding balance.