Duplicate Reg Doc for deceased estate vehicle

My dad passed away a few years ago. One of the cars was still in his name and we are trying to get hold of the reg doc as it has been misplaced and we are in the process of selling the vehicle. We have been in communication with Wesbank since the 3rd December 2015 via e-mail. We spoke to a consultant who advised what we needed to send through in order to obtain a duplicate (which we cannot do through the licensing dept as it is an archived account). All documentation was sent through THE SAME DAY. We are now more than 2 months down the line, we have no documents and we are being passed from pillar to post regarding the matter. We were told 9 days ago that the doc would be couriered within 10 working days, but when we phoned today to find out where they are, there is some reason as to why they can't send them again. The buyer for the car is starting to get irate as we are no closer to giving him papers and every time he asks, the story is different thanks to your wonderful service. Every time we speak to someone, we get a different story. At my wits end... :(