DStv (MultiChoice) bad Service.

My name is Muntu Madonsela, I had a contract with DStv in January. They delivered the decorder in the same month (January) and up to this day the decorder has never been installed, meaning I don't have any service rendered to me except the delivery. DStv has charged me an amount of R1170, which I, for umpteenth time questioned. I have been in contact with them via Whatsaap, telephone and likes but have not received any help. The last agent I spoke to whose name is Thembelani also did not help me instead when I asked him if they charge customers for a service that is not delivered, he said 'yes'. I tried DStv stream for 1 day and I was disconnected. Why must I pay? What service has DStv rendered to me since January to this day? Please assist. My contact number is ***.