you'll need to send it to one of the many file-recovery companies. This is an extremely expensive option, as mattyc_92 has said, and unless the files in question are very important it won't be worthwhile. You'll be looking at a minimum charge of around £250, and it could be a lot more.
Most of the recovery companies will give you a quotation, once they've seen the drive. The way it works is that you send the drive to them (at your own risk) and they take a look. Then they'll quote a price.
Not all deleted or formatted files are recoverable. If you are planning to use this method it's extremely important to get the drive to the recovery company as soon as possible - as time passes it becomes less likely that recovery can be made.
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