BAD ATTITUDE AND NO DELIVERY

I have been a Customer for Mtn for 4 Years Since 23/02/2012 till today. I am using a Sony Experia Z1, Its been 3x since I have taken my phone to MTN service provider in protea gardes for repairs as my phone was giving me problems. the past 2x Services that I have handed in my cell phone, the nature of my complaints where factory based Faults of the phone as my phone is on a 24 months guaranteed contract. 09/10/2015 I took my phone to Mtn SP(Protea Gardens ) for repairs as it started giving me problems. I explained in Detail to Ms Dube what problems my phone was giving me and she booked as accordingly. 24/10/2015 I went back to the store to find out the status of my phone and the response was it hasn't arrived yet. 31/10/2014 I went again back at Mtn SP(Protea Gardens), and Asked Ms Dube the status of my phone, All I received from her was an Attitude and accusations that I am liable for the damage of my phone and that mybe I poured water or my sweat on the phone. I asked management (Jeffery Moloi) when he sees job card it states no charge. its only now i find out from them that my Cell phone was never repaired nor Attended till Today now i cant get it back as they require R330 wat