Motel 6

I payed for a room and gave an extra 100 dollar bill on mistake. I called front desk and they confirmed they had it. Was told someone would bring me my change with the extra 100 when they did the correct amount wasn't even in the envelope they handed me. Called front desk again and the story changed. I'm not one to Jump to conclusions but their inconsistency almost assures me that I'm not at fault here.