The Shilla Hotels in Dien Ban

We booked a 3-night ocean view family twin room for a family of 4, and checked in at around 6:30 on the first day. We were assigned to the 2nd floor, but the view was completely blocked by the structure. We went down to the lobby to request a room change, but they said there were no rooms available because they were late. We booked an ocean view, but the view was blocked by the structure, so we couldn't see anything. We asked to be moved to a higher floor, wondering if we had to stay like this for the entire 3 nights. They said that it was on the 5th floor, but the view was worse, and showed us a room where we could only see the walls... When we asked to change it tomorrow, they said there were no rooms available, and they didn't seem sorry. After that, I got angry and complained a little more, and they said they would let us know after talking to the manager. Then they said that there was a double room (a room with one bed, not a family room) tomorrow, so we could change to that room at 5 PM, and they would put in an extra bed. We can check in at 3 PM for general check-in, but we're changing to a double room at 5 PM..? I protested, asking if it was reasonable, and they said they would do it at 1 o'clock. Then I asked how they would compensate me for staying tonight, and they discussed it again.. They said they would give me a coupon for 320,000 won...mango bingsuㅋㅋㅋㅋ I was angry, but Korean communication was not smooth, and the staff's attitude was like everyone was getting the same amount of money and no one complained..The 5th floor room only had a wall, so they gave me the 2nd floor.. I felt frustrated, wondering why they were complainingㅎㅎ I felt like they had a poor understanding of the ocean view. I opened my eyes in the morning and the view outside the window was...ㅋㅋㅋㅋㅋㅋ The next day, around 4 PM, they told me to come down after packing my bags and come down, saying they would give me a new room key (I thought they would just tell me to come get the key or give it to me...). The family all went down and then went back up. The extra bed was not softer, and it was too short for my tall husband, so I had to sleep uncomfortably with my feet out. I chose Shilla because there is no hot spring in Da Nang.. I really won't go there again.. Before the change I'll upload a comparison photo later