If you open the app and go into the Settings, there should be a Feedback button. That's the best way to DIRECTLY 'complain' or give feedback to the devs. I would suggest doing the same from the AC blog webpage so that the AC Editors get the message as well. You may leave an appropriate review on the Play Store, but these usually have little effect until more users start posting negative reviews and uninstalling the app, not necessarily reaching the devs in time or actually reading all messages.