FIRST !! Set your preferences to manual sync to make sure it will not do any further syncs with Evernote Cloud
Method 1:
Try signing out and quitting Evernote on your device and view your Notes using the EN Web client at Evernote.com (must be on a PC or Mac).
Check your Notes there, including the EN Trash.
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Merging Notes does put the original Notes in the EN trash but does NOT permanently delete them.
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To permanently delete the Notes in the trash requires user action (unless there is a bug).
Method 2 : Time Machine if you have a Mac
The key for restoring notes from a Time Machine or from another computer is to disconnect the computer from the internet. If you haven't open Evernote on your PC since you merge the notes, there is a chance you can restore them.
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Disconnect your PC from the internet
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Open Evernote on your PC
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Locate the note and export them How to here
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Once the notes are exported, connect your computer to the internet
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Import the notes to your account
Best of luck!