I'm very sorry to hear about this. Here's a series of troubleshooting steps to try: http://www.microsoft.com/surface/en-us/support/hardware-and-drivers/troubleshoot-the-surface-touchscreen?lc=1033
I realize the article is for a Microsoft Surface, but the general steps still apply. Let me know if you have any further problems.
I purchased a Samsung Ativ tab gt-P8510 but after a windows 8 RT update the touch screen stopped responding and now I have to use a mouse to work on it.
Can someone help me please !!!