I'd definitely look for any alternative to the Landmark, as they are total muppets, or at least think we are.
Looking at a quick trip either end of the month or early next.
Checked Landmark and saw that they have a "Book 2, Get 1 night FREE" deal for July, which was quite enticing. Selected the dates, selected "Premium Corner Room" @ THB4,733 per night, which is pretty much standard pricing for that room, but a great deal when you're getting a 3rd night free. I hit "Reserve Now" just to check that it's valid and lo and behold, it's a bit of a scam.
Night 1 = THB7,100
Night 2 = THB7,100
Night 3 = FREE!
So all they've done is total up what they normally charged for three nights (THB4,733 x 3 = THB14,199) and then divide that into two nights. Scumbags.