@k1
Your vehicle was most probably short levied in terms of duty and now there is a recovery against you for the short levied amount. The tax you will have to pay now is a sequential levy of customs, sales tax and finally income tax. The gentleman who had the vehicle cleared in his name should be dealing with this, in my personal opinion.
Hope this helps. Please feel free to put up any queries.
Regards,
Fahad Bashir,
AC Customs.