No delivery

Good day,

I recently paid my vehicle off and asked Wesbank for my settlement documents as I need to register the vehicle in my name. I received confirmation from them on the 20th that it has been sent for delivery. Last week I started following up as I haven't received any documents where they provided me with the tracking code that was issued by DSV. I phoned DSV and they said that the document was delivered (I didn't even know of the delivery) and someone signed for it. I don't even know who the person is who signed for it, as there is no person by that name living there. I stay in a house, not a complex so it couldn't have been given to someone else. After taking it up with DSV, they said that they will investigate. Today I followed up, where the person dealing with my original issue sent me proof that it was delivered as well as the confirmation of the 'incorrect' person who signed for it. So clearly nothing was done to resolve my issue. Can someone please attend to this? I only had 21 days to register this vehicle in my name and unfortunately can't be held liable for your poor service.