The only option open to you would be to argue that you had a reasonable expectation of renewal. This is a difficult concept to explain, so I will refer you to a couple of web articles. Here
. This explains it in far more detail than I would be able to do so here.
The way forward, now, would be to declare a dispute of unfair dismissal at the CCMA, within 30 days of your dismissal. You can find your nearest CCMA office from www.ccma.org.za. They will assist you with the correct forms (7.11 on the website) to declare the dispute for unfair dismissal and the procedure on how to lodge such a dispute (also listed on the front page of the form).
Since this does not relate to misconduct, you can appoint an attorney to assist you, should you so wish.
The sanctions that you can ask for is for reinstatement, or for a reward equivalent to 12 months' salary as a maximum. Realistically, awards seldom go past 6 months.
I hope this helps you a little bit, but if you have any further questions, feel free to ask them before you rate. It will not cost you anything extra. If you are satisfied with the answer, kindly click on one of the five faces on the ratings page. I don't get anything for this answer unless you do.