Faulty cellphone

I own a Samsung a720 which went in to vodacom repairs Westgate mall for a screen repair in April/May (ref ********** 8) when it came back it wasn't charging properly and when talking to people over a voice call they experience a bad echo on their end, I then took it back to have it fixed these problems (ref ********** 9) it then came back after a week but the problem was still not fixed, i sent it back again to have it fixed again in August (ref ********** 6) it now took longer to have my device back so in my mind I thought they are now gonna do a proper job but to my surprise when I got the device back it is still faulty.

Now imagine in all these months from April to date I am battling to have a working device and to think I was quoted R4800 to have it repairs but I find my phone fixed on such low grade.

I'm a loyal vodacom subscriber and have been using my number since 2004 but I'm not happy with the repair service I received, im even hoping that vodacom can give me my money back, take this phone and I'll go buy a new one once and for all and in that way I know I'll get a proper working device