No Service

To whom this may concern I'm very unhappy with the service from customer care DSTV has give me. I brought a new Decoder on 27 July 2018 and emailed the details for the new decoder to be activated and ever since have had no DSTV. I keep getting a screen errors E17,E600 and E30. On the 8 August 2018 I got someone in to check the signal and was found in working order but still got an error message. I also phone DSTV customer care and spent half an hour on the phone and was told to take it to a service centre. On the 9 August 2018 I took the new decoder to multi choice in the south of Johannesburg and have it tested and it was found to be in working order. On the 10 August 2018 I turned the TV on and got the same error message again ,Which was E30. So on the 11 August 2018 I took the decoder back to multi choice in the south of Johannesburg. Again multi choice told me there is nothing wrong with the new decoder. Multi choice gave me *120*68584# to contact should it happen again. Today I got the same error message again and spend another half an hour at my costs and still with the same error message. Still no help . I would like this sorted out or if you cant please cancel my subscription after being loyal customer for 17 years. I am elderly person TV is one of my few pleasures in life. Best Regards Mrs O Meyer