I have recently purchased an Android tablet named a ZTPad, ever since I received it the touch has been off and it's made the tablet almost impossible to use. I would like to recalibrate it but have no idea how. I'll leave details about the tablet below. And before anyone suggests it, I have tried powering the device off and holding the + volume button whilst switching it back on. It doesn't work.

Cortex A9 dual core

Model number: g04ref
Android Version: 4.1.1
Baseband Version: Unknown
Kernel Version: 3.0.8
android@amdroid #897
SMP PREEMPT Wed Nov 21 17:50:52 CST 2012
Build Number: JRO03C.20121027