48 hours respond never honoured

my pvr decoder showed an error coded after i had switched it off, then called multichoice for assistance they refered me to the nearest help centre which i then took my decoder on the 20 Oct 2015 at pretoruis street, they just told me that the system got interrupted at the time it was updating the software. they then reload the software and gave me back the decoder as i arrive at my place i did the plugged it in, it loaded and them started showing but the display of south african broadcast did not show as it was supposed including etv i went back at the pretorius branch to fix the problem they said they did and again when get home same problem appears again that pictures are no longer showing in a full screen rather less than 32'' <br> <br> I called multichoice and also highlighted to them that they may call me in the morning hours or in the afternoon since i am currently preparing exams and that during that time i will be in front of the tv set. <br> <br> Multichoice agents or its subsidiary never called me no indication that they will call me and i feel that they just want me miss use my phone in calling them while they know that they make falls promises that their technicians will call me.