Fantastic DSTV Installions - not so Fantastic after all

I would rather give then no stars. Fantastic DSTV Installations in Brenthurst Brakpan. We had a problem with our decoder switching itself off all the time. We did everything the consultant at DSTV customer care call centre told us, but nothing worked. So we called Fantastic DSTV installations in Brenthurst (same suburb where we live). They came out, spent less than an hour. Charged me R1,200. Told me they would whatsapp me the invoice. Never received it. After they left the DSTV decoder switched itself off again. I phoned them and was told that it could be the power supply. So we changed the power supply and it worked fine. So my issue with them is, why did they not check the power supply to start off with? Why did I have to pay them R1,200 for doing absolutely nothing. They are not taking my calls and I will probably never get my money back. These people are not authorized DSTV installers. PLEASE DON'T USE THEM. THEY ARE DISHONEST. This is there details: Fantastic Dstv Installation Brenthurst Olga Street, Brenthurst, Brakpan Contact person: Jonson Contact number: 081 766 1712 Alternative contact number :062 887 7562