Radisson Hotels review: Absolute horrible hotel stay... And that's being nice!

I booked a stay with the hotel November 9-13th, 2023 in Germany. Upon check in we had to check ourselves in through a self check that did not work and the employees could not figure out how to make it work. Once we got through this most extensive process, the key and room number was provided. We went to the room which had obviously been another persons room as their person items and luggage were situated throughout the room. We immediately went down stairs to inform the front desk and they then asked if we left our luggage in the room. My immediate response was NO, why would I leave my valuables in a room that is clearly occupied by someone else! They then provided a different room. They never told us about the breakfast buffet that I paid for throughout the stay, never told us where any of their amenities were or how to operate the room as the keycard was needed to have lights or the television on. The car garage NEVER seemingly worked as you could enter but not exit as the Kiosk's were always down on both floors. The hotel restaurant server spoke no English what so ever and just starred at us instead of asking a collegue to help. We had to ask a German lady sitting next to us to translate what was needed with the meal. We also paid 8,40 for a bottle of water that was sitting in our room for free. There was two days that the breakfast was not used as one was due to your restaurant being full with no available chairs or tables and was over capacity. Instead of the hostess not allowing anyone else in and stating to people that you were at capacity, she continued to let people in! I asked for a manager everyday and every night and on each request, I was told there is no manager on duty for four days. The maid would take towels but not replace them and on one day around 12ish, I went downstairs asking that they bring some to our room however we didnt get them until 1130ish that night which clearly was a little late as we were asleep and found alternate means of taking a shower.