making my name bad at SARS

Hi I got a phone call from SARS saying that I owe them R64000 .I did not know what they are talking about. I got hold of a book keeper to find out what is going on and what the book keeper found out was very interesting. He said that money was taken of my salary for tax but big save never paid it to SARS.i do not work for big save anymore I got fired unfairly since December 2014 .so what did big save do with that money? Did someone used it to go on holiday or did they buy a new car with it or did one of them need new mags for the bakkie .what happened to that money.is this what a big company do with someone they fired unfairly. Just to proof a point.i have all the documents from the book keeper and SARS.or must we sort this out in court.please help.