Here are basic steps to recover your WhatsApp:
In order to get back your stolen WhatsApp account, you need to delete and reinstall WhatsApp on your device with your phone number.
You will receive a six-digit verification code via SMS that WhatsApp reads and logs you in automatically. Once you log-in, the hacker will be automatically logged out of your account.
If the attacker activates the two-step verification after gaining access to your WhatsApp account, you will have to wait for seven days to recover your account.
To secure your WhatsApp account from scammers, never share your activation code with anyone. Beware of the calls that ask you to share your personal information or ask you to install certain apps.
Another way to stop hackers from further using your WhatsApp account is to deactivate it. To do that, send an email to Support at support@whatsapp.com with the title “Lost/Stolen: Pls deactivate my account” in the body.
After deactivation, you have 30 days to reactivate your account.
Also, make sure to always check the WhatsApp web. Whatsapp Web is the extension of the Whatsapp messenger, used to synchronize your phone with your Computer. When stolen, Log on to your PC and click on the option ‘Log out from all the computers’.