Wesbank poor customer service

I have paid in full my vehicle finance with wesbank. I received a notification to pay R350 towards the finalization of my Natis documentation. Proof of payment, were send directly from the bank, upon payment, with the right reference number. Once again i did submit proof of payment, in pdf format as requested by Wesbank. Email, upon email, and this can’t be resolved. All i need is to have the process completed. Their customer service is really bad, and i will never recommend wesbank to any body. I also paid my other vehicle on exactly the same day, with MFC. This was completed within two weeks. Maybe wesbank, can take lessons in customer relations and service at MFC