Faulty Device

I bought a Samsung Galaxy Trend Neo from CNA on the 29/03/2016; from the time i had the phone i had the following problems: The phone reboots by its own. When I go into the internet. It just shows white, I have to go out of the application and go back again and it will either go into the application or not. When I go into whatsup, Gmail, playstore, etc it takes long to go in or it just goes totally out. I took the phone to a Vodacom repair store who informed me that I have to ask MTN to send me their phone settings because its a Vodacom phone; I've done that but I'm still experiencing the same problems. I don't even had the phone for a month and it was giving me the above mentioned problems. I need a refund please. I send the same message to your customer services but didn't receive any feedback