SARS import taxes not collected and impossed on unlicenced vehicles.

Unlicenced,unregistered cars driving on our roads. How is it possible that imported cars are using our roads, not having paid Import taxes? Is it because the owner was at the time a traffic official of city of cape Town, and gets overlooked? Registration number N3401-WB, traveling daily from 24 Merlot Way, Northpine to 34 Gemini street, Brackenfell industrial. 7am to brackenfell industrial, and 4:30pm to Northpine. Red, Ford Puma coupe.