**** repairs, no customer service

I picked up my S4 earlier this evening from the Vodaworld repair centre after its 4th booking for repairs. I was told that nothing is wrong with the phone, all they did was a software upgrade and I was told I'm good to go. I booked in my phone last week, just two weeks after picking it up and then today I'm told its fine. I plugged it in to charge and lo and behold the first indication that nothing was done is indicated. I specifically said I wanted the phone replaced I cannot keep driving up and down to get every piece of this phone fixed just to have another piece broken only to do this again. The phone is insured with vodacom it's barely halfway through its contract, payment has never been missed yet when trouble appears no assistance is given. I am frustrated with Vodacoms don't care attitude towards customer and I want my phone replaced immediately I will not go through 8 more months of glitch fixes, why have insurance and guarantee/warrantee when u get left in the lurch no matter what precautions u take to keep your valuables safe. The matter has been escalated twice yet nothing is done