Unprofessional service from WEBUYCARS

Terrible experince trying to sell my vehicle. 2 weeks ago i had a salesman here. We did the whole process then the system told us that we needed an updated natis. I said why...no because of my surname. I ma married now so the natis must be in my new surname. Ok went all the way to the traffic department. They told me mam, they are crazy you cant do an updated natis just because of your surname. People get married every day, your id is the same. I phoned WE BUY CARS while i was there, explaining, the salesman said he will call me back. Phoned me back in 20 min stating No its been updated all is well they can buy the car. They told us they will be here today, early this morning they arrive, put in everything, AGAIN the system is asking for the natis. AFYER THEY SAID ITS SORTED!!! its been 5 hours Everytime the salesman just calls me back his manager is still busy. Really!!!!!!! Busy with what??? Why doesn't he call me himself and just atleast apologise?? This is really becoming very unprofessional. No idea what to do next.