I have a complaint.
The shower head in the bathroom is broken.
The shower head in the bathroom doesn't work.
I can't stand such a dirty environment.
I'm not content with your service.
be content with...
The guest in the next room made great noise.
A: I have a complaint.
B: What's your problem. Madam?
A: I called room service last night to tell them the broken bathroom lights and asked them to come over and fix it. No one comes to fix it till now. Your service attitude annoys me too much.
B: I apologize to you on behalf of our hotel. What time did you call room service last night?
on behalf of...表示“代表...”
A: Before eight o'clock. It's not late, right?
B: This is our error, please tell me more details. Please let me know your room number and your name.
A: I'm Joe. My room number is 1203. A woman answered when I called yesterday.
B: Alright, I see. I'll check with the room service department at once. I promise this won't happen again. To make up for our mistakes, I decide to let you stay in our hotel for another day for free.