Samsung S6 Edge still not working

My second complaint on the same issue. I took my S6 Edge in after 1 month of use. The LTE stopped working (initially 4G everywhere, then one day no LTE - and yes, they checked settings) could barely browse, and the calls were dropped/nobody could hear me on the receiving end. Booked in for repairs 30 May. Job ***2. Replaced main board, battery pack. When they got it back the fingerprint scanner did not work, so checked back in immediately job ***2. Still just getting 'currently in the assessment process at the advanced repair centre. Its a month later and still without a phone. Cant Vodacom see the product is faulty and issue me with a new phone??? Surely there is something fundamentally wrong with it? No idea when to expect it back either but I dont want a phone that is faulty especially since I have to use it for 2 years? That Cell-C contract buy out sounds fantastic right now. Been with Vodacom since they started but this is ridiculous.