Paying for a damaged phone

I've took out a contract at Telkom Mobile in Mountain Mill Mall Worcester. The lady there recommended a Sony phone and I took it....now I'm so disappointed that I did. I've reported since last year that the phone overheats and freezes and sometimes just dies and I have to take the phone apart to let it cool off because the battery smells like burned tyre. No-one wants or cant help me and just say \we don't book phones for repairs call this number or that number\"....and in the end it's a dead end. I'm currently paying for a phone that I cant use because it's a health-risk!!! I've called the shop and the lady that assisted me told me to call 081180 to book my phone and I did....but no-one can or will help me. At one point the phone got so hot that I dropped it.<br> This is customer service at it's worse!!!! I live far away from the shop that I've bought it.<br> In the end I'm the one loosing out!!!!"