How to Recover Missing Contacts Caused after iCloud Restore?

“Yesterday setup a new Iphone from a recent Icloud backup. The setup was fairly smooth and successful. Today I notice that the contacts with whom I have been talking and texting yesterday are missing. Later realised many of my contacts are missing. So I erased all the contents and took the same backup again. Voila ! I got all my contacts back. But within 10mins I lost some contacts again. Not sure why this is happenning. Can anyone help me on restoring all my contacts and break this deletion process ?  iPhone 5s, iOS 9.2” 
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