No signal

A Year or two ago MTN installed a aerial in our business premises as the signal was very poor in our area, since <br> October last year we have had no signal again, they sent someone out in Oct and he checked the box and cords and said the plug was not connected properly and left. <br> <br> The signal is very poor we cannot hear any conversation and most calls just goes straight to voice mail.<br> <br> I have phoned every week and get the same response they will escalate it as urgent and nothing gets done.<br> <br>