Faulty hardware on Experia Z3(Job number ***4)

I took out a contract on the Sony Experia Z3 with Vodacom and I must say I am not impressed with the hardware on the phone. The screen kept coming off at the top and I took it in for repairs last year November and was told to pay for the repairs even though I had never damaged the phone. Last month the same problem started all over again even though It had just been fixed in November. Vodacom told me that Sony phones only get fixed by the Sony repair centre and I am convinced that the sony Z series is either made using inferior quality inputs judging by the countless reports I am picking up about the Z3 &amp; the Z5!!! <br> <br> I would like my phone to be replaced or repaired at no charge as I never damaged it!!!! It's really sad that Sony has dropped its standards as it's a brand I used to love but clearly the hardware used on their phones are sub standard.