If you're unable to see the 'last seen' status of a contact on וואצאפ, it could be due to one of the following reasons:
1. The person might have disabled their 'last seen' status in the privacy settings.
2. You might have been blocked by the person.
3. There could be a problem with your internet connection.
To troubleshoot this, follow these steps:
1. Check your internet connection and ensure it's stable. You can do this by opening a webpage in your browser. If it doesn't load, you might need to fix your internet connection.
2. If your internet connection is stable, try to update your וואצאפ to the latest version. You can do this by going to Google Play Store or Apple App Store, then search for וואצאפ and tap on 'Update'.
3. If the problem persists, it's likely that the person has either blocked you or changed their privacy settings to hide their 'last seen' status. In this case, there's nothing you can do to view their 'last seen' status.