No delivery of Contract Upgrade

I was contacted by Cell C on 10 September 2015 regarding a potential early upgrade (including a new phone). I went through the process on the phone and was told that delivery would take place within 7 working days. As of today (08 Oct) I have still not received the upgraded phone or have had any contact from Cell C. I have sent sms and emails to their customer care details and no response at all. Phoning their call centre is a complete joke as one just holds indefinitely without the opportunity to speak to someone.