Poor after Sales Service and Support from Vodacom

I have reached my wits-end with the poor after sales service support I have received from both Vodacom New Market Alberton and Samsung (Samsang S6 EDGE Plus Gold7). My wife entered into an upgrade contract for my daughter through Vodacom on 5 November 2015. From day one the phone has been giving problems. The phone was first returned 10 November (within 7 days) because the AUX / Ear component was working intermittingly. We were simply told the phone was not faulty. Since then we have been back 4 times with a similar response to say the phone is not faulty. I assure you I have better things to do than wanting to spend my time going back and forth to Vodacom on a continuous basis. When collecting the phone on the last occasion we then could not get signal and could not even test the AUX/Ear component again. The error response now shows \No Service". Then Vodacom try telling my daughter it is her SIM Card that is the problem. Simply put the response is nonsense as my daughter had little choice but to use her Samsang S4 whiles her phone is in for repair and oddly enough no such issue occurs with her old phone. Vodacom seem not to have the skills or ability to support their sales sevice"""