FNB Phone

So as per last complaint so FNB decides that they are not going to cancel the phone that I don't want because my request wasn't in the 7 day cooling off period, and I just didn't have the strength to continue with a battle I'm clearly not going to win. So anyway I keep the phone.. Guess what the stupid phone stopped working, I activated this phone on 03/02/2016 and from 28/02/2016 the damn phone has no network whatsoever, today is Wednesday 02/03/2016, its still not working, I have lost very important call due this stupid problem, I called FNB connect and there's nothing they can do, I called Smart Devices and I'm going to wait for a phone, what must happen in the meantime.. My number is no longer available due to this... Help!!!!!!