Brand new phone \Repaired"and still faulty"""

I started a brand new Smart XL contract with Vodacom at the end of April. When the phone arrived it took 2 weeks for my old pay as you go number to be ported to the contract so I couldn't use it for the firs t2 weeks. Then, when it did get transferred to the contract I discovered that the phone (a brand new S6 Edge) was not picking up 3g or 4g data services, after countless calls the phone went in for repairs. after close on 2 weeks I got the phone back only to find that it still does not pick up 3G/4G signal. It has been over a month with a brand new phone and contract and Vodacom refuse to provide me with a new handset to replace this obviously faulty one. I wonder what MTN would do in this case? Wait actually I know what they would do because I have been in contact with them and they say they would have replaced it immediately if the issue had not been fixed after going in for repairs. <br> <br> Lack of communications and feedback to customers is driving me insane, my emails get ignored and it's impossible to get through to anyone without holding on for 20+ minutes.I've been trying for days to escalate the matter and SPEAK to someone and yet I get no response to my request for this.