Do not show up to fix their mistakes

I got them to fix a fault with my DSTV; they charged me R3500. A couple of weeks in the DSTV is doing the same, so I assume they did not fix what they said they had. I contacted them because they offer a 3-month warranty. We made two appointments (waiting all day in both cases) and they never showed up. Do not use this company. https://www.martinelectronics.co.za