Cell C is refusing to exchange a faulty Sony M5.

I took out a new contract with Cell C and received an Sony Experia M5 handset on the 08/01/2016. It was faulty so I booked it for repair at Cell C Wonderpark on the 22/01/2016 . Although the terms and conditions state that it will take 12 business days to repair, I only received it back on the 13/02/2016. I then switch it on once to reload all my information and saw it needed to be charged. From that time on it would not switch on at all. It is totally unacceptable that a hand set coming back after 3 weeks in repair is worse than before. Does this mean i will be without a hand set for another 3 weeks. Cell C is still deducting their monthly charge even though I am unable to us my hand set and free minutes, as my old phone uses a different sim card.<br> <br> I want two things from Cell C:-<br> <br> 1) I want the hand set replaced with a Samsung to the same value.<br> 2) I my account credited for the time it has been or is in repair. <br>