Cape DSTV Installers Stole my DSTV Dish and Refuse to Return it

This company came to my house. Told me that my Dish is incompatible with my device. They then charged me R2500 for a new dish and then proceeded to steal the old one. I am in a rental home. That dish is not mine. I have tried unsuccessfully for 2 months to get my dish back and I just get met with empty promises. I am also now convinced that they lied to me about the incompatibility issues because of their lack of integrity.