Cect I9. I have a cect I9 and yesterday the touch screen just quit working with no warning. i can

Question

I have a cect I9 and yesterday the touch screen just quit working with no warning. i can turn the phone on and off and i still can receive incoming call but that's it. to answer the the incoming call I need to hit the volume button on the side of the phone. the phone is only three week old. Any Help?