My Horrible Experience With Cell C and Sony M5

I Received a Sony Xperia M5 Dual Sim (Worst Phone on Earth) In December 2015 on Contract With Cell C, 3 Days After I got the Phone It was Faulty, Constantly Switching itself Off, and Only Turning back On when Connected To a Charger, I charged the Phone for a day Thinking the Problem would be solved By charging it for a Longer period, Still over the next few days the Phone had the same issue, So I Took To The Internet and searched This Issue, Only to Find Out That Thousands of People all over the world have the same issue with The very same Phone, So Sony Sells Trash Phones, I called Cell C and advised them of This, I was told that because the 7 day Period was over I needed to Book The Phone In For repairs, which I did (Barely a Month After Getting the Trash Phone). I waited almost a week for someone to Come and pick Up the Phone and send it in for repairs, Finally RAM came to Pick Up The Phone, The Phone was sent in for repairs (I had no Phone for 3 Weeks), I eventually got the Phone and It came back WITH PROBLEMS THAT ARE EVEN WORSE!!!!! I Called in to cell c again and was told the Phone needs to Booked In For Repairs! Are You People serious?!? How Am I Meant to accept that??! I h