Uhm. I'd have to agree with you - 34K is only average mileage. I'd still expect the trim to stay on. I might be a bit more lenient about worn leather or fabric, but not the trim itself. Might be worth going back to Renault Customer Service again to tell them you're not satisfied. It also strikes me that the trim is probably falling off due to a failed clip or similar, so it doesn't sound all that expensive to put right?