Terrible service

I upgraded my contract mid April and received a Sony Experia Aqua. Not even 3 weeks later the handset started to give me problems. It was booked in and sent to Johannesburg. They did a Software upgrade and in the process lost all my data. I waited about 2 weeks for my phone to be returned to me. Not even 2 weeks later the handset had the same problems like before. It was sent to the Advanced repairs centre again. Up to this day my phone has been sent for repairs 4 times. Apparently it is now at the supplier. The last day I handed in my handset was 25 July. It is now 39 days later and still NO PHONE. I am a customer of Vodacom, not Sony Ericson. Complaint letters have been sent to numerous people, as well as constant phone calls to try and follow up on the progress of the problem. Everyone is just blaming everyone else. I am paying every month for something that I do not have.