Worst Service Ever

Approx. 2 months ago my phone has been booked in with one fault after the other. The phone is still within its warantee period and i expected the problem to be resolved once it was booked in. My phone came back with the same faults, seemed like nothing was repaired. I then booked in and complained 2 - 3 more times and it seemed like my phone was repaired.Now my phone has been returned and i discover that the camera no longer works.It is not responding at all...never had this problem before it was sent to your technicians.This is completely unacceptable.I was also asked to send back my phones accessories by your customer care consultant and this was never returned to me even upon request emails.This is the 4th time that i am complaining about this phone and it is only a few months old. I want this phone to be replaced with either a new one or I expect a refund. I am sorry but your technicians do not have a clue as to what they are doing, instead of repair they are creating more damage and you expect me to just accept the phone back like this. I am a regular shopper at take alot and for you to treat me like this is really unacceptable. I will take this matter further.