Disguisting Cell C Service

I did an upgrade on my contract through cell c. I was so excited to get my Sony M5, was delivered and I was all happy. 5 weeks later my phone screen went black and I could not use the phone so I took it to cell c Pavillion on the 28th March 2016. to date I have heard not one word, so I called the store and have been given a complete run around. not only have they not even sent my phone off from the store, but the store manager is not very helpful. I have told them that the staff member who assisted me whom is Andile should have called me should he have needed any other information. the manager just said sorry he will do what he can but with a bad attitude. I would like to get a new phone and cell c direct has said that they are happy to replace the phone but yet I will sit without a phone for who knows how long.....