E143 error.

My husband and I bought an extra decoder and added xtra view to our package last week Wednesday. It was successfully installed. Ever since we had the xtra view we have not been benefiting out of watching anything on the TV. We been getting the E143 error on it since we got the xtra view. We have been calling customer service every day since last week Wednesday. Followed instructions, we do the same thing over and over again. They sending the signal's but as soon as we hang up we get the same error. When we call back they say that the matter has been escalated to the technicians and they will call us back as they are not available. You speak to different agents that say we going to get a call.... We still waiting...no call....no picture....just this E143 error. We have spend a lot of money on airtime and we are not getting any satisfaction out of calling Multi Choice, we have been patient and have been loyal customers for years and have never experienced this much stress to get our query resolved. Can somebody anybody just sort this out please!