Making excuses and not giving me my phone

I took my U929 in for repairs to the Durban service center about a month ago, on a Friday. They told me it will be ready on the following Monday. I still haven't got the phone! Whenever we call the service center they have a new excuse why the phone is not ready. Of late they started telling us that the phone is ready and they are sending it to us via courier. It is about 10 km from where I live to the service center yet a week since they gave it to the delivery person, it has yet to arrive!