how to restore inadvertently deleted WhatsApp contacts

[Android Central Question]

I was trying to delete the message I was sending to 4 contacts and inadvertently deleted them too

 

[SpookDroid]

Contacts aren't stored in Whatsapp, they're stored in your phone's Contact List (messages are a different story and cannot be recovered unless you restore from a previous Whatsapp backup file from the app's Backup and Restore settings).

For contacts, unless you saved your contact list to a cloud service, there's no way to recover them. If you are saving your list to Google, you can 'roll back' to a previous state within the past 30 days to undo the deletion from the Contacts website (contacts.google.com).