APPALLING, BAD , TERRIBLE SERVICE!!!

I am at my wits end with DSTV:-( I have phoned 5 times, my husband twice and the Installer twice. We have spent hours on the phone trying to sort this out! We have been promised that the "supervisor" will phone back etc etc. Needless to say we are still waiting!!! This has been going on for weeks now - We have DStv premium and have XtraView. One of our decoders packed up and we had to order a new one. The installer phoned DStv to replace the old decoder with the new one......We were then connected for a few days and cut off -E16 error code.. I phoned, was on the phone for an hour and was told that we need to make a payment. We Have a debit order that goes off every month. I emailed the POP three times and eventually got our private banker to write a letter confirming that the debit order had gone off our bank. We were then reconnected - three days later we were disconnected again! I phoned, spent another hour and a half on the phone explaining that we had replaced a decoder etc. They reconnected us-three days later we were cut off again and so it has been going on for weeks now. All we did was replace a decoder that is linked to our two other decoders! We just cannot get it sorted out!!! Whoever you talk to on the phone has no clue and you get a different answer every time! Its just not good enough!!!!! Very Bad and useless Service!