Iphone 4 multi-touch not responding in a certain spot?

I have been experiencing this problem for quite some time now and now its getting annoying. I dropped my iPhone 4 before and it made a lot of cracks on the top of the screen, and after that, whenever i try to touch this certain part of the screen, it wouldn't respond. The spot is about the middle of the screen and i can't drag down notification center because when my finger goes over the spot it would stop because it thinks that i pulled my finger off of the screen at the spot. I have noticed the spot is a horizontal line that when you touch it nothing happens. And the corners of the device are not responding either. So please give me tips on what i should do now.

It sounds like you might need a new digitizer - http://www.amazon.com/...B003UGVU4G

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