Sony Z3 Compact

Good Day, I have recently upgraded my contract at the beggining of Feb and got the Sony Z3 Compact which within 3 days completely failed. I sent it back as an out of box failure to which they sent the same phone back saying nothing wrong. Two days later problems again phone just would not worked reset the whole phone worked for a day and then back to the same story. It has been back at Cell C repair centre for 2 weeks which they have now outsourced i am tired of waiting i get no responses and no information. I ahve also contacted Sony who have done nothing. I am paying alot for my contract for which i dont have a phone. I had 3 calls from Cell C trying to get me to upgrade but now there is a problem not one call. THIS IS AN OUT OF BOX FAILURE EITHER REPLACE IT OR FIX MY ONE PROPERLY OTHERWISE I WILL CANCEL MY CONTRACT AND POST THIS ALL OVER SOCIAL MEDIA.