I tried to sync my iphone 4, all my contact list got messed up, all of them got douplicated. And plus I got some of my old deleted contact lists back to my iphone!!what should I do?

I tried to sync my iphone 4, all my contact list got messed up, all of them got douplicated. And plus I got some of my old deleted contact lists back to my iphone!!what should I do?

iTunes only keeps one backup, every new backup replaces the old one, only backups used to restore from are not overwritten and marked with a time stamp.
If you can't find any other backup in iTunes/Edit/Preferences/Devices, your contact info's are gone. Only if you included the backup folder in your computer backup routine, you would be able to restore the old backup folder containing the latest backup at that time.
The location of the backup folder is described in this article: iPhone and iPod touch: About backups

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