Unhappy [Q] goo phone M8 problems touch screen

I have purchased a goophone M8.
I have received it, but it has a touch problem , if i touch the screen between 2 or 3 cm from the bottom it not work good.
For exemple when i open the phone i try tu put my sim card password, i couldn't entering my password because every time i touch the number 9 it write me the number 6, same when i write message if i touch some letters he touch me two letters same time , or for select something or scrolling in the band between two or 3 cm it not work good.
It is a rom problem or a hardware? ity exist some other rooms for my phone?