Why is my whole touch screen unresponsive

I have had my Galaxy S6 for a month now. It's always been inside of an otterbox, NEVER has came out. Never been dropped, wet, ect. But MULTIPLE times a day my phone won't allow me to use my screen. For example, when i try to draw my password pattern on my phone.. i can't do so because my screen is unresponsive. If I am recieving a phone call, I cant swipe to answer nor decline. all my buttons work, my home, lock and volume buttons. I can even get into my phone with my thumb print. But when it comes to physically being able to use my phone, i just CANT. My screen hasn't worked for 24+ hours. Ive let the battery drain.. I've even held my down volume+ home + lock button to reset my phone and STILL nothing. This is a bit ridiculous considering i bought this phone BRAND new and have only had it for ONE month.. please, ANYONE help me.. i'm open to any/ everything.

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