Screen doesn't respond to anything and is frozen

I have this Digiland tablet that I have that i bought at office depot, so the tablet worked a couple times before completely freezing. I can turn the volume up and down but the screen is always stuck and it does not respond to my touch as it should because it is a touch screen. It hasn't been dropped and I tried reseting it and the screen just does not work. It charges and everything works except it does not respond to my touch, PLEASE HELP!! thanks