Dstv challenges

Hi, I got decoder kit installed on the 15 Dec 2018, since then am unable to watch TV in peace, there are types of error codes keep on displaying on. I went to Multichoice agency 2 times and they said ain't finding any problems, I am always calling multichoice for help ain't working. Today is worse as am unable to watch even a single channel. I choose compact package, channels like 161,194,193 etc ain't working. Am so tired as they keep on telling we will clear the error code but nothing. I even used the neighbors decoder to check if is not the cable, the neighbors decoder functions probably.