IOS 7 ruined my iphone. How to get it working?

I receently updated my iPhone 4 to iOS 7 and it's ruined my phone. I listen to a lot of music and it deleted all my music and when I try to put music on with the new iTunes it doesn't sync. It keeps saying 'updating files on iPhone' but it's stuck there.

I didn't have these problems until I updated my phone and iTunes. How can I get it working again? Should I downgrade it to a previous iOS?

I think downgrading is the best option.

But their iOS updates ain't allowed to delete your stuff so I would complain to them. Maybe you could gt something out of it too

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