3rd time for repairs still not fixed

December 2013 I took out a Z10 on contract which was replaced October 2014 the replacement phone has been in for repairs 3 times now which I collected for the 3rd time this morning. The phone is still not fixed! I asked for a new phone because this one is clearly unrepairable - best of all the engineers report said there was no problem! If their is no problem with the phone why would I have booked it in?? Terrible service. They want me to book it in again! For the fourth time! Truly beyond unhappy with Vodacom.