No response to phone that is dead on arrival

I purchased a Google Nexus 6 from Orange. The phone was duely delivered only to not be working at all. I reported it to Orange and was sent a return form. The form along with the phone in its original packaging was returned personally to Orange in Sunninghill. That is the last I have heard. No follow up. Call centre via email keeps on telling me they have escalated the matter with the relevant department. It is a week later and several emails and I get no further than the support desk email stating that the matter is escaled.<br> <br> An hour later on the phone to Orange in Sunninghill and nobody seems to be willing to take the call.