I should have gotten an IPhone

after more than a year of taking my s5 in for repairs and not having the problem resolved, I made the mistake of getting an S6 edge. This worked fine until the 3 August. All of a sudden I couldn't answer incoming calls and when I make outgoing calls no one could hear me. Spent the whole night trying to resolve issue with vodacom. Put my sim into an apple device and it worked fine. Took my brand new phone in to the service centre in woodmead. Where they replaced the screen but never addressed the fact that can't be heard on the phone. I contacted Wandile at Samsung Bryanston and he confirmed that they should have looked at the reason for callers not being able to hear me. Confirmed this was not done. I explained that I am a rep and I need my phone. Was asked to go to their Boksburg service centre, despite the fact that I was due to go for an operation and had limited time available, I went to find that the service centre was closed for prayer in a Friday. Wandile assured that because I want a refund, I don't need to wait 2 hours for them to return, but that he would have my return approved. One week later and I still have no working unit. No response from Samsung