IPhone 4 touchscreen problems?

I've had my iPhone for just over a year now and the other day, me and my friend was mucking about and he was wrestling me for my phone. It turned off for around two hours and wouldn't turn back on. Ever since, the touchscreen hasn't been working properly, for example: I'll be typing a text and it'll randomly scroll through the texts, click on the delete option or just randomly type loads of letter no where near whatever letter I was trying to type, so it couldn't of been a mistype. This is really getting on my nerves! Please help? Also, I have a cracked screen if that makes any difference? But it's been there for ages and hasn't made any difference to the phone itself.

May be its manufacturer fault so you should go to apple service center.

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