Error 143-4

I’m very disappointed with DSTV I am paying DSTV every month diligently but the service I receive is pathetic. I am paying for service but I can’t use it on top of that it is also costly to call they call center as this is a cost to the customer. I have no other option as I don’t know what to do in this instance and to constantly get the installer out is also costly as I need to pay him for the call. My setup is as follow: Primary decoder is a Explora 2 Secondary decoder is Explora 1 on Xtraview I keep on getting a E143-4 error on the secondary decoder. I called the call center on numerous occasions spoke to Pumzile and Melusi these are just two names I can remember, I rebooted the decoder but still had no luck. The installer has been at my house and the problem is still there. The last agent we spoke to even said that we must not switch of the decoder or the TV he will investigate and get someone to call me up until today I have not received a single call from DSTV. Can anyone please provide some assistance / help?