Natis document

I've requested a Natis document from WesBank for my late father, I've requested it in December 2021 and I'm still struggling... The only way to communicate is via email and that's going nowhere... When you call the call center the consultants are extremely rude and put you on hold for 20 minutes... Wesbank said they will contact my brother today and no one called... How do we get this matter resolved? Because calling doesn't help sending emails doesn't help and at the end of the day the vehicle is paid up and we need the Natis documents... Very quick to collect the monthly installment but rendering the service afterward is nowhere to be found... PATHETIC!!!!