Wesbank continues to debit my account for a vehicle that is settled with them.

I have recently settled an account with Wesbank, registration documents for the vehicle I have settled also emailed with a paid up letter, but Wesbank continues to debit my account for it. When I call their call center, I am told that the money to settle have been received but they did not receive the proof of payment. I do not understand how the registration documents with a paid up letter was released if they do not have all the requirements to do so. Now they are really inconviniencing me as that money is now redirected for other things. This is unbelievable? A poor service !!!