Four Seasons Stays in Tokyo

We stayed four nights in two rooms. On the third day, the sheets were changed, but upon returning, we found obvious stains. Since it was already past 11 PM, we didn't contact the hotel, and the two of us slept in one bed. The other bed also had stains. On the fourth day, we went to the front desk to complain, providing photos. They said they should report it and told us to wait for a call. We didn't receive a call all day. When we returned to the hotel that evening, we asked the front desk. The night manager checked the computer and found we had complained, but didn't explain why there hadn't been any action taken all day. They finally offered to waive the room service meal fee for the other room. We didn't accept, but the result was the same upon check-out. Question 1: We weren't at the hotel during the day; we booked the Four Seasons specifically for a good night's rest. Is room service meal equivalent to a good night's sleep? What is the basis for this action? Question 2: After a whole day of processing, there was no response. They completely ignored our complaint. Is this the service standard of the Four Seasons? Or is it just that the sheets are often like this and it's not a problem? Question 3: The attitude was polite but arrogant. What justifies this condescending attitude? This is completely different from our past experiences with Four Seasons hotels and the service we've had in Japan. The photo below is incomprehensible and unacceptable.

There are three Four Seasons in Japan, and two in Tokyo. The same brand has different investors. The Four Seasons in Marunouchi is not like Four Seasons. I believe China’s Quanji can surpass it. The gate is hidden in a particularly safe corner, and the lobby shows the simplicity of Shijia. It’s okay if you don’t open the windows in the room, but if you open the curtains, it’s the roof of another house. The price is very four seasons, and it is more cost-effective to go to Otemachi for a few dollars.