If your WhatsApp is hacked, you can retrieve it back in less than 10 minutes if you have a good network connection.

Do not report your number for Whatsapp to block it. Take the recovery simple steps:

1. Uninstall the WhatsApp app from your phone.
2. Go to play store and download it afresh.
3. Launch the app with the same phone number. Make sure you have the sim card bearing that number which was hacked.
A six-digit code will be sent to your phone number via sms.
4. Enter the six-digit code that WhatsApp sends to you via sms. This logs you into your account immediately, and automatically logs out the hacker.

If you are asked to provide a two-step verification code, when you did not set up one, it means the individual using your account must have activated a two-step verification code.

Since you do not have the code, it means you have to wait 7 days again before you can sign in without the two-step verification code.

Remember that the hacker had been logged out immediately you were logged in with the 6-digit SMS code.

So the hacker cannot continue any chat with your contacts and they cannot even get access to your WhatsApp account during this period.