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If you want to recover WhatsApp chat history, click “WhatsApp” and you can preview all your WhatsApp chat history to choose which torestore on your computer. Click “Recover” button, and within few minutes you can retrieve your WhatsApp deleted messages from your Android.

You can restore all the previous messages in your smartphone by again installing whatsapp app and providing the same number.

well, try running a windows based recovery software after connecting your memory device of phone with computer, this will recover mostly everything :D if it's not too late

Have you ever tried to use WhatsApp to restore your data? Cuz it actually supports to back up and recover data on WhatsApp.  However, you need to reinstall the app as to make a recovery. If it still fails, have a try on Android Data Recovery [recovery-android.com] on RecoveryAndroid. I did successfully get my lost  [recovery-android.com]WhatsApp messages back on Galaxy S7 [recovery-android.com] a few days ago. It realy helps. Hope it helps you either. GOOD LUCK!