I update all apps using the Aptoide platform (I distrust ggl). Aptoide automatically notifies me when an app has an updated version available. Then I update manually. When I have downloaded an update, I am prompted, on the screen of my phone, to install the app; the app name appearing at the top of the screen. I always check to make sure the app name is what it ought to be. The latest version 316.0.0.0.10, of Messenger is named as Work Chat. The version of Messenger I currently have installed is 315.0.0.1.119. The current version on ggl play is stated to be 313.0.0.15.119! I could have a fake version installed.
I have just uninstalled the version of 'Messenger' I have, using Revo, and installed the current Aptoide trusted version, 316.0.0.0.57, which was named Messenger when I installed. All now seems okay.
It is possible I recently overlooked a fake installation when I last updated, but if this was the case, then Aptoide would have been deceived into recognising it as the legitimate app update from their trusted source.
Anyway, now I seem to have the legitimate version installed. Ggl play however, seems to have a very old version as its latest update.