CELL C SELLS DEFECTIVE PHONES

I am utterly disappointed with Cell C and their customer service. On 31 Dec 2015 I got the Sony M5 Aqua. I've had to book it in for repairs after a month and half of it giving me problems. I booked it in for repairs and 3 weeks later it was not fixed. I had to rebook it. I have to sit 6 weeks without a phone now. My partner has had huge problems with that phone (SONY M5 AQUA) and when we have gone to the store several times, the staff says that that brand of phone has defects. I firstly don't understand why that phone was sold to us - and secondly why CELL C has being so difficult in helping me get a new brand of phone. I am paying for a phone I do not have in my possession. I NO LONGER WANT THE M5 AQUA - cell c has acted in bad faith selling so many customers DEFECTIVE PHONES! CELL C is a USELESS service provider. I would like them to do the right thing for once and give me a quote for another phone of a different brand. I should have never left VODACOM- cell c has a long was to go. I will be sharing both my partner and my bad experience with everyone. THIS IS UNACCEPTABLE!!!!