meandmeb, there are 2 alternatives you could look to. One of course, would be to get the touchscreen fixed by either sending it back to its country of origin for repairs by Apple, or you could order a replacement screen from one of the many online PDA stores in China or Thailand.

Your second alternative, which I would recommend first trying, its to try and increase the sensitivity of the upper portion of your screen. This option can be added into your Preferences by following the instructions in the following link.

http://limitededitioniphone.com/iphone-tou...se-sensitivity/

Hopefully this'll fix your problem.