BRAND NEW PHONE ALREADY IN FOR REPAIRS?

About a month ago I started having issues with my brand new samsung s6 edge. I took the phone in, and I received it back after 2 weeks. After carefully inspecting the phone, I realized that the problem was solved, but the vodacom technicians damaged my screen whilst repairing the phone. So the next day I took the phone back to vodacom, tried really hard to explain to the the reception what the issues was, as they didn't understand the issue. The phone was booked in again. After 3 days, I received the phone back, and guess what, they could not find the problem. This is ****ing ridiculous, the so called technicians are useless. So we eventually got hold of the manager at the repair centre, and the phone was booked in again. I have now been almost a month without my phone. Still no sign of it. What I really don't understand is why I am paying so much for an expensive phone, but vodacom cannot replace the device, they insist that it needs to be repaired? This is not acceptable, I did not break or damage the device, why must I suffer for vodacom's negligence? My Phone is only one month old. I WANT A NEW DEVICE, I AM PAYING A SMALL FORTUNE FOR A FAULTY DEVICE!!!