Failing to deliver my NATIS documents.

Worst service, I have paid up my vehicle loan on the 5th of January and have been **** to everytime I call for arrangements of my NATIS documents. Wesbank and it's courier company called Dsv have been not been honest with me, Dsv is claiming that they have sent back my documents to wesbank while wesbank is saying that they're out for delivery by Dsv, this has been going on since the 22nd of January. My license disc has expired and I'm risking by driving the car to work, if I get involved in an accident the insurance is not going to repair or replace my vehicle. I might be issued with a notice for driving a vehicle that it's license disc is expired. I have records including emails from both wesbank and Dsv courier company. I'm so disappointed.