Phoning 5 times for the same error and no help from DSTV or installers

I upgraded my decoder with the price lock promotion to an Ultra. Since the installers installed in September I have had issues with poor signal. Throughout the day I get an E48-32 error and my signal is scrambled. It comes right by itself sometimes. So here's my complaint...I phoned to report the issue on 15 Sep then again on 22 Oct and again on 5 Nov and again on 8 Nov and today again on 12 Nov. I've been told since 22 Oct that they are going to send the installers (who they appointed) back to come and fix the problem on the installation. When I phoned today the line cut off, they don't phone me back they just leave it. This after I've spent over an hour of my airtime on the phone with them over this time.

I'm going to stop my debit order, you can come and collect your Explorer Ultra, I am not getting what I paid for. I never had this problem before your installers redid my installation.