Let me tell you that Whatsapp, backup chat history every day at 4 AM in your phone’s internal storage. So, if you have backup of whatsapp chat history, then you can easily restore chat history from your backups.

Here how to whatsapp data on your Android:

• Simply uninstall WhatsApp on your phone.
• Then re-install WhatsApp on your phone from Play Store.
• Launch WhatsApp and verify your phone number. After verifying your phone number you will be prompted to restore your messages history.
• Simply tap on “Restore” and everything of last 7 days will get restored.

If you do not have any backup, then it is highly recommended that you must use Android Data Recovery Software to restore lost or deleted data from your Android phone.