Stagnation of share prices

During October 2006 I baught 430 share for the amount of R4 300.00 (R10.00 per share) at Welkom Yizani Invesment Limited (Phuthuma Nathi). I was promised that after 5 years i will make triple the amount I invested. The shares came only available for selling in November 2014. When I went on the shares site I found that the selling price is still R10.00 per share. When I called the company and asked why the share prices are still the same after 8 years, they told me thats not their problem because it depends on the buyers. So I asked if they can pay back my money they said there is no way they the will pay back my money. The sadist part is that kept my money in their account for more than 8 years without any interest. The shares are currently sold for R10.00. Is there anything else i can do to get my money with interest back? It will be appreciated if you could advice me please.<br> <br> Thank you so much