Having worked retail from warehouse to store I know that unless we are told what is happening we will not be able to fix what is broken.
But if you are going to complain, please remember to take the time to say thank you when someone goes that extra mile to fix the problem. I know this may be a temporary fix, things may go slack again, but at least now they are aware of it. This will also give them the opportunity to make sure this issue dosen't repeat in another store.