Sony Xperia M2 Aqua

Dear Sony. It is me again. Following my last complaint I have had to take my phone to Vodacom repairs three more times for the same problem. The Sony Service Centre keeps telling me that there is no fault. My phone is less than a year old and has been in for repairs seven times but THERE IS NO PROBLEM!!! Who do I have to go to or complain to to get a replacement phone?, Vodacom says that SONY must.. Sony says there is no problem. I am so disappointed that I will never ever get a Sony phone again. I was contacted by Sony before only to get the same kind of lip service that I get from Vodacom. Surely there is someone that can make the call to replace my phone? Surely there is still some kind of customer service out there? Seems like social media is the only way. Seriously I'm done with SONY....