ITunes won't let me restore iPhone 4?

A few days ago i dropped my iphone off a bridge and onto a duel carriage way when i went down to get it, it was shattered. Today i went to get it fixed and when i went to get it back they said all you need to do now is go home and restore it and it will come on but i have tried several times now to restore it and it keeps saying something like can't restore iPhone due to an unknown problem then a (1) next to it… Could somebody please help as i can't get my iPhone to come on with out it being restored.

Go in google and get the apple number, call it, and have a worker walk you through it so they can figure out the problem

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