Upon Check-in, I was offered a room upgrade at a very modest price - first I denied but then I accepted to get my room shown and afterwards the one I could upgrade to. It took the receoptionist a few minutes to get a key card managed and off we went to my room - which was openedd very reluctantly by the receptionis, as if it she wasn't sure if it was occupied. I immeditely knew this couldn't be my room. When shown the upgrade option, it was exactly the category I had booked and paid for. So I got offered a chargeable upgrade to the very room I had already paid for. On the bed sat a note of the hotel manager, namely welcoming me to their hotel. After I mentioned that this was the category I already paid for, the receptionist left the room and mumbled something of the like "I'll speak to them management"... Late evening, during dinner, I was called by the hotel to tell me that management had decided "to not charge the upgrade". What an audacity. It should have been an apology that the receptionist made a mistake but ths call made me confident that this hotel runs a fraudulent scam scheme, trying to sell upgrades to tourists to squeeze extra money out of them. By the way, had a native vietnamese speaker by my side, so the apology issued next day, mentioning "language barrier", doesn't apply.