NEW SUMSUNG GALAXY S6

I purchased the new Samsung Galaxy S6 from Cell C - Westgate Mall and have this device for almost 1 month and its giving problems. I cant answer calls or use anything on the device because for some reason the touchscreen do not work anymore???? This is my work phone and obviously make use of the phone on a daily basis. Now Cell C want to send the phone back to Samsung for a month to get it back with all my contacts and app installed all wiped clean. Never again shall I make this mistake with Samsung and Cell C.