Decoder swap and monthly replacement which isn't working

I have a major complaint with my decoder which started in September 2021 the decoder shows an error that it's *******, I have swamped to my 3rd decoder which the 1st I was charged R710 and was given an old decoder which came from repairs. And now the 3rd decoder is showing the same error and I have tried to troubleshoot through calling the call center and doing troubleshooting manually but it still doesn't work, the last time I was at your branch the consultant advised that if I have the same issue I will get to swap to another decoder which will not be new and which can have the same problem. Going to your branch is time consuming and is very inconvenient for me as a client. I need this to be looked into and also a guarantee that I will not be experiencing any problems again as my monthly subscription is paid with no fail and such issues will leave me with no choice but to cancel the subscription.