Multi choice(DSTV)

I have a decoder I have not been using for 2 years and last week Thursday I went to reconnect it, the problem is it does not show any visuals as it gives me the 30-4 notification. I called asking them to fix it and they kept on saying it is fixed but still was not seeing any visuals. I called multi choice call centre asking that my money be reversed and they told me that they have reported my matter and in the next 48 hours I will be contacted and find a way that I can be refunded but nothing has happened.