S6 Edge not working

I recently upgraded my contract on Red Advantage contract about 2 months ago, from Samsung Galaxy S4 to the new S6 plus. This is my 4th Samsung phone in 6 years. The phone has not been working properly since I received it. I have since sent the phone for repairs twice, and no improvement noted. I was told that there is no fault on the phone, which clearly, to me, shows that Vodacom did not read the fault description when the phone was booked in. I firmly believe that this is a factory fault and cannot be fixed, and Vodacom is not willing to exchange it for a new phone. The mobile data function does not work properly. I never reach 4G or LTE reception on the S6 but my S4 is able to do so. Internet is extremely slow and pages either time out or does not load. Delay in what app messages. Incoming calls cannot be answered at times. When a call is made or received, I can hear the other caller on the line but the caller cannot hear me. My old S4 works a hundred times better than the S6 which is totally *******.<br> <br> I did get a call from Samsung after my first booking, and was assured that action will be taken. To date, no follow up or action has been taken.