Appalling service

I've been waiting for A WHOLE MONTH for delivery of a new handset (for which I am already paying).

All that every consultant can tell me is that they will get the deliveries department to contact me. The same story each time I call, each and every day.

Not a single person assumes responsibility for customer queries and your issue gets passed on the the next consultant. The only thing they can tell me is that the deliveries department has been trying to contact me on a landline number which doesn't belong to me.

Each time I call their offices, I give my correct contact details to a new consultant. To date, I still haven't been contacted and it isn't my service providers fault. So then whose fault is it??? And who is to be held accountable for the payment of a device which hasn't been delivered, as well as the hours spent holding on the phone waiting for them to find out what's going on at they're company???

At which stage would they contact the sender for correct contact details???

I've tried escalating the matter to the team leader, who hasn't seen it through to completion either and I was unable to speak to any other superior at their company. So who do I escalate it to actually, and how, because I demanded contact details for somebody senior, which the consultant refused to provide!!!