PATHETIC!!!

I bought a Samsung Core +- 4 mnths ago, within the 7 day period I started having problems with the phone. I took it back to Edgars Canal Walk where I originally bought it from. When I purchased the phone the salesman told me if I have any problem with it they will replace it immediately, guess what when I took it back I was told he cannot exchange the phone, must send it away for repairs. I was then told to take the phone to Vodacom where they told me there was nothing wrong with the phone. After struggling for a while with this someone told me to go to Samsung direct which I did. The phone went it for repairs twice with the same problem where it keeps cutting out. After collecting my phone for the 2nd time I was told the mother board was replaced, this is now after they had the phone for about 2 weeks. On the 26th September I took the phone back with the same problem, for the 3rd time now nearly 2 weeks later again, I am told there is no update on my phone and they will get the manager to phone me back . When I phoned on 02 October I was told that they are waiting on a part to arrive from Jhb, my honest opinion I don't think they know what the problem is with the phone.