Is there any competent people taking charge still working at Vodacom??

I've booked in my phone for repairs more than a month ago. Vodacom quoted us R2250.54 to get it fixed in the end paid R2350.54. The Sony does not switch on. Vodacom replaced the screen...Don't know what that has to do with switching on the phone but still not fixed. The phone has been sent back twice from the branch to the repair centre and the problem is still not resolved. Is it so difficult to test a phone before sending it to Your branch to stop wasting cost and time of everyone because of incompetence?? job numbers: ********** 9, ********** 6, ********** 4. Is there anyone with competent knowledge to resolve this?? I've asked the manager to give me a call from the advance repair centre but even that seems to be too difficult!!