Excuse me. I bought the CD here two days ago. It's scratched, and doesn't play properly.
I'm sorry about that, sir. I'll get you another one.
The thing is I've replaced once already. I think it's just a faulty batch.
I see. Maybe I can offer you a credit note.
Well. To be honest, that's not much use to me. I'll leave the country tomorrow. I'd really prefer a refund.
OK, sir. I'll see what I can do.